Carrier 17EX User Manual

Page 1
17EX
Externally Geared Centrifugal Liquid Chillers
50/60 Hz
1500 to 2250 Nominal Tons (5280 to 7910 kW)
Start-Up,Operation,andMaintenanceInstructions
SAFETY CONSIDERATIONS
Centrifugal liquid chillers are designed to provide safe and reliable service when operated within design speci­fications. When operating this equipment, use good judg­ment and safety precautions to avoid damage to equip­ment and property or injury to personnel.
Be sure you understand and follow the procedures and safety precautions contained in the chiller instructions as well as those listed in this guide.
DO NOT VENT refrigerant relief valves within a building. Outlet from rupture disc or relief valve must be vented outdoors in ac­cordance with the latest edition of ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engineers) 15. The accumulation of refrigerant in an enclosed space can displace oxy­gen and cause asphyxiation.
PROVIDE adequate ventilation in accordance with ASHRAE 15, especially for enclosed and low overhead spaces. Inhalation of high concentrations of vapor is harmful and may cause heart irregulari­ties, unconsciousness, or death. Misuse can be fatal.Vaporisheavier than air and reduces the amount of oxygen available for breathing. Product causes eye and skin irritation. Decomposition products are hazardous.
DO NOT USE OXYGEN to purge lines or to pressurize a chiller for any purpose. Oxygen gas reacts violently with oil, grease, and other common substances.
NEVER EXCEED specified test pressures, VERIFY the allowable test pressure by checking the instruction literature and the design pressures on the equipment nameplate.
DO NOT USE air for leak testing. Use only refrigerant or dry nitrogen.
DO NOT VALVE OFF any safety device. BE SURE that all pressure relief devices are properly installed and
functioning before operating any machine.
DO NOT WELD OR FLAME CUT any refrigerant line or vessel until all refrigerant (liquid andvapor)hasbeenremovedfromchiller. Traces of vapor should be displaced with dry air or nitrogen and the work area should be well ventilated. Refrigerant in contact with
an open flame produces toxic gases.
DO NOT USE eyebolts or eyebolt holes to rig chiller sections or the entire assembly.
DO NOT work on high-voltage equipment unless you are a quali­fied electrician.
DO NOTWORKON electrical components, including control pan­els, switches, starters, or oil heater until you are sure ALLPOWER IS OFF and no residual voltage can leak from capacitors or solid­state components.
LOCK OPENANDTAGelectrical circuits during servicing.IF WORK IS INTERRUPTED, confirm that all circuits are deenergized be­fore resuming work.
AVOID SPILLING liquid refrigerant on skin or getting it into the eyes. USE SAFETY GOGGLES. Wash any spills from the skin with soap and water .If any enters the eyes, IMMEDIATELYFLUSH EYES with water and consult a physician.
NEVER APPLY an open flame or live steam to a refrigerant cyl­inder. Dangerous overpressure can result. When necessary to heat refrigerant, use only warm (110 F [43 C]) water.
DO NOT REUSE disposable (nonreturnable) cylinders or attempt to refill them. It is DANGEROUS AND ILLEGAL. When cylinder is emptied, evacuate remaining gas pressure, loosen the collar and unscrew and discard the valve stem. DO NOT INCINERATE.
CHECK THE REFRIGERANT TYPE before adding refrigerant to the chiller.The introduction of the wrong refrigerant can cause dam­age or malfunction to this chiller.
Operation of this equipment with refrigerants other than those cited herein should comply withASHRAE-15 (latest edition). Con­tact Carrier for further information on use of this chiller with other refrigerants.
DO NOTATTEMPTTO REMOVE fittings, covers,etc., while chiller is under pressure or while chiller is running. Be sure pressure is at 0 psig (0 kPa) before breaking any refrigerant connection.
CAREFULLY INSPECT all relief devices, rupture discs, and other relief devices AT LEAST ONCE A YEAR. If chiller operates in a corrosive atmosphere, inspect the devices at more frequent intervals.
DO NOT ATTEMPT TO REPAIR OR RECONDITION any relief device when corrosion or build-up of foreign material (rust, dirt, scale, etc.) is found within the valve body or mechanism. Replace the device.
DO NOT install relief devices in series or backwards. USE CARE when working near or in line with a compressed spring.
Sudden release of the spring can cause it and objects in its path to act as projectiles.
RUN WATERPUMPS when removing, transferring, or charg­ing refrigerant.
DO NOT STEP on refrigerant lines. Broken lines can whip about and cause personal injury.
DO NOT climb over a chiller. Use platform, catwalk, or staging. Follow safe practices when using ladders.
USE MECHANICAL EQUIPMENT (crane, hoist, etc.) to lift or move inspection covers or other heavy components. Even if com­ponents are light, use such equipment when there is a risk of slip­ping or losing your balance.
BE AWARE that certain automatic start arrangements CAN EN­GAGE THE STARTER. Open the disconnect ahead of the starter in addition to shutting off the machine or pump.
USE only repair or replacement parts that meet the code require­ments of the original equipment.
DO NOTVENT OR DRAIN waterboxes containingindustrial brines, liquid, gases, or semisolids without permission of your process con­trol group.
DO NOT LOOSEN waterbox cover bolts until the waterbox has been completely drained.
DO NOT LOOSEN a packing gland nut before checking that the nut has a positive thread engagement.
PERIODICALLY INSPECT all valves, fittings, and piping for cor­rosion, rust, leaks, or damage.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 2 Tab 5d
PC 211 Catalog No. 531-721 Printed in U.S.A. Form 17EX-1SS Pg 1 7-97 Replaces: New
Page 2
CONTENTS
Page
Page
SAFETY CONSIDERATIONS ......................1
INTRODUCTION ABBREVIATIONS 17EX CHILLER FAMILIARIZATION
Chiller Identification Label System Components Cooler Condenser Compressor Control Center Motor Starter (Purchased Separately) Economizer/Storage Vessel
REFRIGERATION CYCLE OIL COOLING CYCLE
Compressor Oil Cooling External Gear Oil Cooling LUBRICATION CYCLE Compressor Lubrication Cycle External Gear Lubrication Cycle
STARTERS CONTROLS
Definitions
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ANALOG SIGNAL
DIGITAL SIGNAL
VOLATILE MEMORY
General PIC System Components
......................................11
.......................12
PROCESSOR/SENSOR INPUT/OUTPUT MODULE (PSIO)
STARTER MANAGEMENT MODULE (SMM)
LOCAL INTERFACE DEVICE (LID)
SIX-PACK RELAY BOARD
EIGHT-INPUT MODULES
FOUR-IN/TWO-OUT (4-IN/2-OUT) MODULE
OIL HEATER CONTACTOR (1C)
COMPRESSOR OIL PUMP CONTACTOR (2C) AND GEAR
OIL PUMP CONTACTOR (5C)
HOT GAS BYPASS CONTACTOR RELAY (3C) (Optional)
OIL AUXILIARY RELAY (4C)
CONTROL TRANSFORMERS (T1-T4)
CONTROL AND OIL HEATER VOLTAGE
SELECTOR (S1)
OIL DIFFERENTIAL PRESSURE/POWER SUPPLY
MODULE
LID Operation and Menus
.......................16
GENERAL
ALARMS AND ALERTS
LID DEFAULT SCREEN MENU ITEMS
MENU STRUCTURE
TO VIEW OR CHANGE POINT STATUS
OVERRIDE OPERATIONS
TO VIEW OR CHANGE TIME SCHEDULE OPERATION
TO VIEW AND CHANGE SET POINTS
SERVICE OPERATION
PIC System Functions
..........................32
CAPACITY CONTROL
ENTERING CHILLED WATER CONTROL
DEADBAND
PROPORTIONAL BANDS AND GAIN
DEMAND LIMITING
CHILLER TIMERS
OCCUPANCY SCHEDULE
Safety Controls
...............................33
SHUNT TRIP
Default Screen Freeze .........................33
Auxiliary Compressor Oil Pump Control Auxiliary Gear Oil Pump Control Shaft Seal Oil Control Ramp Loading Control Capacity Override High Discharge Temperature Control Oil Sump Temperature Control Oil Cooler Remote Start/Stop Controls Spare Safety Inputs Spare Alarm Contacts Condenser Pump Control Condenser Freeze Prevention Tower-Fan Relay Auto. Restart After Power Failure Water/Brine Reset Demand Limit Control, Option (Requires Optional
8-Input Module) Surge Prevention Algorithm Surge Protection Lead/Lag Control
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COMMON POINT SENSOR INSTALLATION
CHILLER COMMUNICATION WIRING
LEAD/LAG OPERATION
FAULTED CHILLER OPERATION
LOAD BALANCING
AUTO. RESTART AFTER POWER FAILURE
Ice Build Control
..............................40
ICE BUILD INITIATION
START-UP/RECYCLE OPERATION
TEMPERATURE CONTROL DURING ICE BUILD
TERMINATION OF ICE BUILD
RETURN TO NON-ICE BUILD OPERATIONS
Attach to Network Device Control
...............41
ATTACHING TO OTHER CCN MODULES
Service Operation
.............................42
TO ACCESS THE SERVICE SCREENS
TO LOG OFF
HOLIDAY SCHEDULING
START-UP/SHUTDOWN/RECYCLE SEQUENCE Local Start-Up Shutdown Sequence Automatic Soft Stop Amps Threshold Chilled Water Recycle Mode Safety Shutdown
BEFORE INITIAL START-UP Job Data Required Equipment Required Using the Economizer/Storage Vessel and Pumpout
System Remove Shipping Packaging
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...43-45
MOTOR
EXTERNAL GEAR
Motor Electrical Connection Motor Auxiliary Devices Open Oil Circuit Valves Tighten All Gasketed Joints and Guide Vane
Shaft Packing Check Chiller Tightness Refrigerant Tracer Leak Test the Chiller Standing Vacuum Test Chiller Dehydration
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Page 3
CONTENTS
Page
Page
Inspect Water Piping ..........................50
Check Optional Pumpout Compressor Water
Piping Check Relief Devices Inspect Wiring
....................................50
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CHECK INSULATION RESISTANCE
Motor Pre-Start Checks External Gear Pre-Start Checks Carrier Comfort Network Interface Check Starter
.................................53
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MECHANICAL STARTERS
SOLID-STATE STARTERS
Compressor Oil Charge Power Up the Controls and
Check the Compressor Oil Heater
........................54
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SOFTWARE VERSION
Set Up Chiller Control Configuration Input the Design Set Points Input the Local Occupied Schedule
(OCCPC01S)
Input Service Configurations
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PASSWORD
INPUT TIME AND DATE
CHANGE LID CONFIGURATION IF NECESSARY
MODIFY CONTROLLER IDENTIFICATION IF
NECESSARY
INPUT EQUIPMENT SERVICE PARAMETERS IF
NECESSARY
MODIFY EQUIPMENT CONFIGURATION IF
NECESSARY
CHECK VOLTAGE SUPPLY
PERFORM AN AUTOMATED CONTROL TEST
Check Pumpout System Controls and Optional
Pumpout Compressor High Altitude Locations Charge Refrigerant Into Chiller
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TRIMMING REFRIGERANT CHARGE
INITIAL START-UP Preparation Manual Operation of the Guide Vanes Dry Run to Test Start-Up Sequence Check Motor Rotation
...........................57-62
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INITIAL MOTOR START-UP
Disc Coupling Installation and Alignment
.........59
IMPORTANT INFORMATION
Check Oil Pressure and Compressor Stop Calibrate Motor Current Demand Setting To Prevent Accidental Start-Up Hot Alignment Check Doweling Check Chiller Operating Condition Instruct the Operator
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COOLER-CONDENSER
ECONOMIZER/STORAGE VESSEL
PUMPOUT SYSTEM
COMPRESSOR ASSEMBLY
COMPRESSOR LUBRICATION SYSTEM
EXTERNAL GEAR LUBRICATION SYSTEM
CONTROL SYSTEM
AUXILIARY EQUIPMENT
CHILLER CYCLES
MAINTENANCE
SAFETY DEVICES AND PROCEDURES
CHECK OPERATOR KNOWLEDGE
THIS MANUAL
OPERATING INSTRUCTIONS Operator Duties
...............................62
..................62,63
Prepare the Chiller for Start-Up .................62
Starting the Chiller Check the Running System Stopping the Chiller After Limited Shutdown Extended Shutdown After Extended Shutdown Cold Weather Operation Manual Guide Vane Operation Refrigeration Log
PUMPOUT AND REFRIGERANT TRANSFER
PROCEDURES Preparation Operating the Optional Pumpout
Compressor
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READING REFRIGERANT PRESSURES
Transferring Refrigerant into the
Economizer/Storage Vessel Transferring Refrigerant into
the Cooler/Condenser/Compressor Section Return Chiller to Normal Operating
Conditions GENERAL MAINTENANCE
Refrigerant Properties Adding Refrigerant Removing Refrigerant Adjusting the Refrigerant Charge Refrigerant Leak Testing Leak Rate Test After Service, Repair, or Major Leak
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REFRIGERANT TRACER
TO PRESSURIZE WITH DRY NITROGEN
Repair the Leak, Retest, and Apply
Standing Vacuum Test Checking Guide Vane Linkage Contact Seal Maintenance
.......................68
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SEAL DISASSEMBLY
SEAL REASSEMBLY
Chiller Alignment
.............................71
ALIGNMENT METHODS
PRELIMINARY ALIGNMENT
NEAR FINAL ALIGNMENT
FINAL ALIGNMENT
HOT ALIGNMENT CHECK
DOWELING
WEEKLY MAINTENANCE Check the Lubrication System
SCHEDULED MAINTENANCE Service Ontime Inspect the Control Center Check Safety and Operating Controls Monthly Changing the Oil Filters
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COMPRESSOR OIL FILTER
EXTERNAL GEAR OIL FILTER
Oil Specifications Oil Changes
.............................77
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COMPRESSOR OIL
EXTERNAL GEAR OIL
MOTOR SLEEVE BEARING AND PUMPOUT
COMPRESSOR OIL
Inspect Refrigerant Float System Inspect Relief Valves and Piping Coupling Maintenance Motor Maintenance
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CLEANLINESS
SLEEVE BEARINGS
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Page 4
CONTENTS (cont)
Page
Page
Motor Handling/Rigging ........................81
Motor Storage External Gear Storage
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SHORT-TERM STORAGE (Indoors)
LONG-TERM STORAGE (Indoors)
EXTENDED DOWNTIME
Compressor Bearing Maintenance External Gear Maintenance Inspect the Heat Exchanger Tubes
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COOLER
CONDENSER
Water Leaks Water Treatment Inspect the Starting Equipment Check Pressure Transducers Pumpout System Maintenance
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OPTIONAL PUMPOUT COMPRESSOR OIL CHARGE
PUMPOUT SAFETY CONTROL SETTINGS
Ordering Replacement Chiller Parts
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MOTOR REPLACEMENT PARTS
EXTERNAL GEAR REPLACEMENT PARTS
TROUBLESHOOTING GUIDE Overview Checking the Display Messages Checking Temperature Sensors
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RESISTANCE CHECK
VOLTAGE DROP
CHECK SENSOR ACCURACY
DUAL TEMPERATURE SENSORS
Checking Pressure Transducers ................84
OIL DIFFERENTIAL PRESSURE/POWER SUPPLY
MODULE CALIBRATION
TROUBLESHOOTING TRANSDUCERS
TRANSDUCER REPLACEMENT
Control Algorithms Checkout Procedure Control Test Control Modules
.................................85
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RED LEDs
GREEN LEDs
Notes on Module Operation Processor/Sensor Input/Output Module (PSIO)
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....97
INPUTS
OUTPUTS
Starter Management Module (SMM)
..............97
INPUTS
OUTPUTS
Options Modules (8-Input) Four-In/Two-Out Module
.....................98
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INPUTS
OUTPUTS
Replacing Defective Processor Modules
.........98
INSTALLATION OF NEW PSIO MODULE
PHYSICAL DATA AND WIRING SCHEMATICS INDEX
INITIAL START-UP CHECKLIST FOR 17EX
....................................115-120
EXTERNALLY GEARED CENTRIFUGAL LIQUID CHILLER
..........................CL-1 to CL-12
....99-114
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Page 5
INTRODUCTION
Before initial start-up of the 17EX unit, those involved in the start-up, operation, and maintenance should be thor­oughly familiar with these instructions and other necessary job data. This book is outlined so that you may become fa­miliar with the control system before performing start-up pro­cedures. Procedures in this manual are arranged in the se­quence required for proper chiller start-up and operation.
This unit uses a microprocessor controlled system. Do not short or jumper between terminations on circuit boards or modules; control or board failure may result.
Be aware of electrostatic discharge (static electricity) when handling or making contact with circuit boards or mod­ule connections. Always touch a chassis (grounded) part to dissipate body electrostatic charge before working in­side the control center.
Use extreme care when handling tools near boards and when connecting or disconnecting terminal plugs. Circuit boards can easily be damaged. Always hold boards by the edges and avoid touching components and connections.
This equipment uses, and can radiate, radio frequency energy. If not installed and used in accordance with the instruction manual, it may cause interference to radio communications. It has been tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference when operated in a commercial environ­ment. Operation of this equipment in a residential area is likely to cause interference, in which case the user, at his own expense, will be required to take whatever mea­sures may be required to correct the interference.
Always store and transport replacement or defective boards in anti-static shipping bag.
ABBREVIATIONS
Frequently used abbreviations in this manual include:
CCN — Carrier Comfort Network CCW — Counterclockwise CHW — Chilled Water CHWR — Chilled Water Return CHWS — Chilled Water Supply CW — Clockwise ECW — Entering Chilled Water ECDW — Entering Condenser Water EMS — Energy Management System HGBP — Hot Gas Bypass I/O — Input/Output LCD — Liquid Crystal Display LCDW — Leaving Condenser Water LCW — Leaving Chilled Water LED — Light-Emitting Diode LID — Local Interface Device OLTA — Overload Trip Amps PIC — Product Integrated Control PSIO — Processor Sensor Input/
Output Module RLA — Rated Load Amps SCR — Silicon Control Rectifier SMM — Starter Management Module TXV — Thermostatic Expansion Valve
17EX CHILLER FAMILIARIZATION
Chiller Identification Label (Fig. 1) —
tification label is located on the right side of the chiller con­trol center panel. The label contains information on model number, refrigerant charge, rated voltage, etc.
The iden-
System Components (Fig. 2) — The components
include the cooler and condenser heat exchangers in sepa­rate vessels, compressor,compressorandgear lubrication pack­ages, control center,speedincreasereconomizer/storage vessel, motor, and starter. The compressor drive consists of an ex­ternal gear (speed increaser) and an electric motor. All con­nections from pressure vessels have external threads to en­able each component to be pressure tested with a threaded pipe cap during factory assembly.
Cooler — This vessel (also known as the evaporator) is
located underneath the condenser, next to the economizer/ storage vessel. The cooler is maintained at lower tempera­ture and pressure so that evaporating refrigerant can remove heat from water flowing through its internal tubes.
Condenser — The condenser operates at a higher tem-
perature and pressure than the cooler and has water flowing through its internal tubes in order to remove heat from the refrigerant.
Compressor — This component maintains system tem-
perature and pressure differences and moves the heat­carrying refrigerant from the cooler to the condenser.
Control Center — The control center is the user inter-
face for controlling the chiller and regulates the chiller ca­pacity as required to maintain proper leaving chilled water temperature. The control center:
• registers cooler, condenser, and lubricating system pressures
• shows chiller operating and alarm shutdown conditions
• records the total chiller operating hours and how many hours the chiller has been running
• sequences chiller start, stop, and recycle under micro­processor control
• provides access to other CCN (Carrier Comfort Network) devices
MotorStarter (Purchased Separately) — The starter
allows the proper start and disconnect of electrical energy for the compressor-motor, oil pump, oil heater, and control panels.
Economizer/Storage Vessel — During normal op-
eration, this vessel functions as an economizer,returning flash gas to the second stage of the compressor and increasing the efficiency of the refrigeration cycle. During periods of shut­down and service, the economizer/storage vessel can serve as a storage tank for the refrigerant.
REFRIGERATION CYCLE (Fig. 3)
The 17EX chiller can be used to chill either water or brine. The data in this book applies to either application. Appli­cations using corrosive brines may require using special tubes, tubesheet, and waterbox materials which are special order items.
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Page 6
LEGEND NIH — Nozzle-In-Head *Any available cooler size can be combined with any available condenser size.
NOTE: For details on motor size designations, see below.
ASME
‘U’ STAMP
ARI (Air Conditioning
and Refrigeration
Institute)
PERFORMANCE
CERTIFIED
(60 Hz Only)
Fig. 1 — Model Number Identification
6
Page 7
40
39
38
37
36
35
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15
34
1—Condenser 2—Cooler Suction Pipe 3—Compressor Suction Elbow 4—Guide Vane Actuator 5—Condenser Discharge Pipe 6—Compressor Discharge Elbow 7—Two-Stage Compressor 8—Economizer Gas Line to Compressor
9—Compressor Housing Access Cover 10 — High-Speed Coupling (Hidden) 11 — External Gear (Speed Increaser) 12 — Low-Speed Coupling (Hidden) 13 — Open-Drive Compressor Motor 14 — Compressor Motor Terminal Box 15 — Low-Side Float Box Cover 16 — Gear Oil Pump 17 — Gear Oil Cooler/Filter 18 — Refrigerant Charging/Service Valve 19 — Refrigerant Liquid Line to Cooler 20 — Power Panel 21 — Oil Level Sight Glasses (2)
33
32
31
17EX WITH EXTERNAL GEAR (SPEED INCREASER)
Fig.2—Typical 17EX Chiller Components
30
LEGEND
29
26
22 — Oil Drain and Charging Valve 23 — Oil Heater (Hidden) 24 — Compressor Oil Pump 25 — Compressor Oil Cooler/Filter 26 — Local Interface Display Control Panel 27 — Cooler Relief Valves (Behind Compressor,
28 — Economizer Storage Vessel 29 — Economizer/Storage Vessel Relief Valves 30 — Pumpout Unit 31 — Cooler 32 — High Side Float Box Cover 33 — Cooler Waterbox Drain 34 — Take-Apart Connections 35 — Cooler Marine Waterbox 36 — Cooler Waterbox Vent 37 — Condenser Waterbox Drain 38 — Refrigerant Liquid Line to Economizer/
39 — Condenser Marine Waterbox 40 — Condenser Waterbox Vent
27
28
25
24
Hidden)
Storage Vessel
22
23
20
21
17
18
19
16
7
Page 8
The chiller compressor continuously draws large quanti­ties of refrigerant vapor from the cooler at a rate determined by the amount of guide vane opening. This compressor suc­tion reduces the pressure within the cooler, allowing the liq­uid refrigerant to boil vigorously at a fairly low temperature (typically 38 to 42 F [3 to 6 C]).
The liquid refrigerant obtains the energy needed to va­porize by removing heat from the water or brine in the cooler tubes. The cold water or brine can then be used in air con­ditioning and/or other processes.
After removing heat from the water or brine, the refrig­erant vapor enters the first stage of the compressor, is compressed, and flows into the compressor second stage. Here it is mixed with flash-economizer gas and is further compressed.
Compression raises the refrigerant temperature above that of the water flowing through the condenser tubes. When the warm (typically 98 to 102 F [37 to 40 C]) refrig­erant vapor comes into contact with the condenser tubes, the relatively cool condensing water (typically 85 to 95 F [29 to 35 C]) removes some of the heat, and the vapor con­denses into a liquid.
The liquid refrigerant passes through an orifice into the FLASC chamber.The coolest condenser water flows through the FLASC and allows a lower saturated temperature and pressure. Part of the entering liquid refrigerant will flash to vapor once it has passed through the FLASC orifice, thereby cooling the remaining liquid. The vapor is then recondensed by the condenser water flowing through the FLASC chamber.
The subcooled liquid refrigerant drains into a high-side valve chamber that meters the refrigerant liquid into a flash economizer chamber. Pressure in this chamber is interme­diate between condenser and cooler pressures. At this lower pressure, some of the liquid refrigerant flashes to gas, fur­ther cooling the remaining liquid. The flash gas, having ab­sorbed heat, is returned directly to the compressor second stage. Here it is mixed with discharge gas that is already com­pressed by the first-stage impeller. Since the flash gas has to pass through only half the compression cycle to reach con­denser pressure, there is a savings in power.
The cooled liquid refrigerant in the economizer is me­tered through the low-side valve chamber, reducing the re­frigerant pressure. Pressure in the cooler is lower than in the economizer. Some of the liquid flashes as it passes through the low side float valve. The cycle is now complete.
OIL COOLING CYCLE
Compressor Oil Cooling —
water cooled. Water flow through the oil cooler is manually adjusted by a plug valve to maintain an operating tempera­ture at the reservoir of approximately 145 F (63 C). An oil heater in the reservoir helps to prevent oil from being di­luted by the refrigerant. The heater is controlled by the PIC (Product Integrated Control) and is energized when the oil temperature is outside the operating temperature range of 150 to 160 F (66 to 71 C).
The compressor oil is
External Gear Oil Cooling — The external gear oil
is also water cooled. Water flow through the gear oil cooler is manually adjusted by a plug valve to maintain an oper­ating temperature of approximately 130 F (54 C). If so equipped, an oil heater in the reservoir helps to maintain the oil tem­perature under cold ambient operating conditions. The heater is controlled by an internal thermostat.
LUBRICATION CYCLE
Compressor Lubrication Cycle (Refer to item numbers shown in Fig. 4) —
pump and oil reservoir are contained in the compressor base. Oil is pumped through an oil cooler and filter to remove heat and any foreign particles. A portion of the oil is then di­rected to the shaft-end bearing and the shaft seal. The bal­ance of the oil lubricates the thrust and journal bearings and the thrust end seal. The bearing and transmission oil returns directly to the reservoir to complete the cycle. Contact-seal oil leakage, however,iscollected in an atmospheric float cham­ber to be pumped back to the main reservoir as the oil accumulates.
Oil may be charged into the compressor oil reservoir (Item 8) through a charging valve (Item 6) which also func­tions as an oil drain. If there is refrigerant in the chiller, how­ever, a hand pump will be required for charging at this connection.
An oil-charging elbow (Item 3) on the seal-oil return cham­ber allows oil to be added without pumping. The seal-oil re­turn pump (Item 4) automatically transfers the oil to the main reservoir. Sight glasses (11) on the reservoir wall permit ob­servation of the oil level.
Amotor-drivenoil pump (Item 10) discharges oil to an oil cooler/filter (Item 16) at a rate and pressure controlled by an oil regulator (Item 10). The differential oil pressure (bearing supply versus oil reservoir) is registered on the control panel.
Water flow through the oil cooler is manually adjusted by a plug valve (Item 17) to maintain the oil at an operating temperature of approximately 145 F (63 C). During shut­down, the oil temperature is also maintained at 150 to 160 F (65 to 71 C) by an immersion heater (Item 7) in order to minimize absorption of refrigerant by the oil.
Upon leaving the cooler section of the oil cooler/filter, the oil is filtered (Item 15) and a portion is directed to the seal­end bearing (Item 1) and the shaft seal (Item 2). The remain­der lubricates thrust (Item 14) and journal bearings (Item 12). Thrust bearing temperature is indicated on the PIC controls. Oil from both circuits returns by gravity to the reservoir.
The shaft seal of the open compressor drive must be kept full of lubrication oil, even when the chiller is not operating, to prevent loss of refrigerant.
If the chiller is not operating and the oil pump has not operated during the last 12 hours, the control system auto­matically runs the oil pump for one minute in order to keep the contact seal filled with oil.
IMPORTANT: If the control power is to be deener­gized for more than one day,the chiller refrigerant should be pumped over to the economizer/storage vessel.
The compressor oil
8
Page 9
LEGEND
TXV — Thermostatic Expansion Valve
*The FX compressor and the gear have a water cooled oil cooler.
Liquid Liquid/Vapor Vapor
Fig. 3 — Refrigeration, Cycle
External Gear Lubrication Cycle (Refer to Item numbers shown in Fig. 5) —
tained in the gear base.The external gear oil pump is mounted below the gear with the cooler/filter. Oil is pumped through an oil cooler/filter to remove heat and any foreign particles. A portion of the oil is directed to the gear bearings and gear mesh spray.The remainder is bypassed to the sump. The bear­ing and transmission oil returns directly to the reservoir to complete the cycle.
Oil may be charged into the external gear oil reservoir as described in the section, External Gear Pre-Start Checks, page 51. Observe the oil level in the oil level glass (Item 4) on the reservoir wall.
A motor driven oil pump (Item 10) discharges oil to the oil cooler/filter (Item 12). The pump has an internal pressure regulator to protect the pump in the event of an obstruction downstream. Water flow through the oil cooler is manually adjusted by a plug valve (Item 14) to maintain the oil at an operating temperature of approximately 130 F (54 C).
Oil reservoir is con-
Upon leaving the cooler section (Item 13) of the oil cooler/ filter, the oil is filtered (Item 11) and is directed to the pres­sure control valve (Item 7). Before entering the pressure control valve, the oil pressure (Item 16) and temperature (Item 8) are monitored by the PIC.
A portion of the oil then lubricates the gear bearings (Item 2). Another portion is directed through an orifice (Item 5) to the gear mesh spray (Item 3) to lubricate the gear mesh (Item 1) during operation. Oil from both circuits re­turns by gravity to the reservoir.
STARTERS
All starters, whether supplied by Carrier or the customer, must meet Carrier Starter Specification Z-375. This speci­fication can be obtained from a Carrier Sales Representa­tive. The purpose of this specification is to ensure the com­patibility of the starter and the chiller.Many styles of compatible starters are available, including solid-state , auto-transformer, full-voltage, and, in the case of low-voltage main power sup­ply, wye-delta closed transition.
9
Page 10
13
COMPRESSOR OIL PRESSURE LEAVING FILTER LINE
12
JOURNAL BEARING
CHECK VALVE
15
OIL FILTER
16
OIL COOLER/ FILTER
17
PLUG VALVE
SHAFT DISPLACEMENT & BRG TEMP. CUTOUT CONNECTIONS
TO PIC CONTROLLER
8
MAIN OIL RESERVOIR
14
THRUST BEARING
COAST DOWN RESERVOIRS
1
SEAL-END BEARING
2
SHAFT SEAL
3
OIL CHARGING ELBOW
11
SIGHT GLASSES
10
OIL PUMP & PRESS. REGULATOR
TO POWER PANEL
9
OIL THERMISTOR
7
OIL HEATER
6
DRAIN & CHARGING VALVE
Fig. 4 — 17EX Compressor Lubrication Cycle
5
COMPRESSOR OIL SUCTION PRESSURE
4
PUMP, SEAL OIL RETURN
10
Page 11
1—Gear Mesh 2—Bearings 3—Gear Mesh Spray 4—Oil Level Glass 5—Orifice 6—Oil Supply Pressure
Transducer
7—Pressure Control Valve NOTE: The oil reservoir is at the base of the gear box.
Fig. 5 — External Gear Oil Lubrication Cycle (Plan View)
8—Oil Supply Temperature Thermistor
9—Oil Pump Motor 10 — Oil Pump and Pressure Regulator 11 — Oil Filter 12 — Oil Cooler/Filter 13 — Oil Cooler 14 — Plug Valve
CONTROLS
Definitions
ANALOG SIGNAL — An analog signal varies in propor­tion to the monitored source. It quantifies values between operating limits. (Example: A temperature sensor is an ana­log device because its resistance changes in proportion to the temperature, generating many values.)
DIGIT ALSIGNAL— A digital (discrete) signal is a 2-position representation of the value of a monitored source. (Example: A switch is a digital device because it only in­dicates whether a value is above or below a set point or bound­ary by generating an on/off,high/low, or open/closed signal.)
VOLATILE MEMORY — Volatile memory is memory in- capable of being sustained if power is lost and subsequently restored.
The memories of the PSIO and LID modules are vola­tile. If the battery in a module is removed or damaged, all programming will be lost.
General — The 17EX externally geared open-drive cen-
trifugal liquid chiller contains a microprocessor-based con­trol center that monitors and controls all operations of the chiller.The microprocessor control system matches the cool­ing capacity of the chiller to the cooling load while provid­ing state-of-the-art chiller protection. The system controls cooling load within the set point plus the deadband by sens­ing the leaving chilled water or brine temperature and regu­lating the inlet guide vane via a mechanically linked actua­tor motor.The guide vane is a variable flow prewhirl assembly that controls the refrigeration effect in the cooler by regu­lating the amount of refrigerant vapor flow into the com­pressor.An increase in guide vane opening increases capac­ity.Adecrease in guide vane opening decreases capacity.Chiller protection is provided by the processor which monitors the digital and analog inputs and executes capacity overrides or safety shutdowns, if required.
11
Page 12
PIC System Components — The Product Integrated
Control (PIC) is the control system on the chiller. See T able1. The PIC controls the operation of the chiller by moni­toring all operating conditions. The PIC can diagnose a prob­lem and let the operator know what the problem is and what to check. It promptly positions the guide vanes to maintain leaving chilled water temperature. It can interface with aux­iliary equipment such as pumps and cooling tower fans to turn them on only when required. It continually checks all safeties to prevent any unsafe operating condition. It also regulates the oil heater while the compressor is off and the hot gas bypass valve, if installed. See Fig. 6-10 for the lo­cations of sensors, transducers, and other devices controlled and/or monitored by the PIC system.
The PIC can be interfaced with the Carrier Comfort Network (CCN) if desired. It can communicate with other PIC-equipped chillers and other CCN devices.
The PIC consists of 4 modules housed inside one of 3 lo­cations: the control center, the power panel, or the starter cabinet. The component names and the control voltage of each location are listed below (also see Table 1):
• control center
— all extra low-voltage wiring (24 v or less)
REAR
• power panel — 115 v control voltage — up to 600 v for oil pump power
• starter cabinet — chiller power wiring (per job requirement)
Table 1 — Major PIC Components and
Panel Locations*
PIC COMPONENT
Processor Sensor Input/Output Module
(PSIO)
Starter Management Module (SMM) Starter Cabinet Local Interface Device (LID) Control Center 6-Pack Relay Board Control Center 8-Input Modules (Optional) Control Center 4-In/2-Out Module Power Panel Oil Differential Pressure/Power Supply
Module
Oil Heater Contactor (1C) Power Panel Compressor Oil Pump Contactor (2C) Power Panel Gear Oil Pump Contactor (5C) Power Panel Hot Gas Bypass Relay (3C) (Optional) Power Panel Control Transformers (T1-T4) Power Panel Control and Oil Heater Voltage Selector (S1) Power Panel Temperature Sensors See Fig. 7 Pressure Transducers See Fig. 7
*See Fig. 6-10.
PANEL
LOCATION
Control Center
Control Center
1—Gear Oil Pressure Sensor 2—Thrust Bearing Temperature and
Impeller Displacement Cable
3—Discharge Temperature Sensor 4—Guide Vane Conduit and Cable 5—High Pressure Cutout Switch
LEGEND
6—Compressor Oil Cooler
Solenoid Conduit
7—Oil Heater Conduit 8—Motor Space Heater Conduit 9—Gear Oil Temperature Sensor
10 — Motor High Temperature Switch Cable
11 — Motor Water Cooling Leak Detector 12 — Discharge Oil Pressure Sensor
TEWAC — Totally Enclosed Water-to-Air Cooled
Fig. 6 — 17EX Controls and Sensor Locations
12
Cable (TEWAC Motor Only)
Page 13
LEGEND
13 — Condenser Pressure Transducer 14 — Condenser Entering Water
Temperature Sensor
15 — Condenser Entering and Leaving Water
Temperature Cable
16 — Oil Suction Pressure Sensor
17 — Oil Pump Conduit 18 — Oil Pump Sensor 19 — PIC Control Panel 20 — Condenser Leaving Water
Temperature Sensor
21 — Gear Oil Cooler Solenoid Conduit
LEGEND
22 — Cooler Temperature Cable 23 — Cooler Leaving Water Temperature Sensor 24 — Cooler Entering Water Temperature Sensor 25 — Cooler Pressure Sensor 26 — Refrigerant Charging Valve
Fig. 6 — 17EX Controls and Sensor Locations (cont)
13
Page 14
Fig. 6 — 17EX Controls and Sensor Locations (cont)
Fig. 7 — Control Sensors (Temperature)
Fig. 8 — Control Sensors
(Pressure Transducer, Typical)
LEGEND
LID Local Interface Device PIC Product Integrated Controls PSIO — Processor Sensor Input/Output Module
1—Optional 8-Input Module for Spare Inputs to Control
Interface (One of Two Available)
2—PSIO 3—LID Input/Output Interface Panel Display 4—Oil Differential Pressure/Power Supply Module (Hidden) 5—LID Light (Hidden) 6—6-Pack Relay Board 7—Circuit Breakers (4)
Fig. 9 — Control Center (Front View);
Shown with Options Module
14
Page 15
15
LEGEND
EQUIP GND — Equipment Ground GRD Ground M—Motor TEWAC Totally Enclosed Water-to-
Air Cooled
Fig. 10 — 17EX Chiller Power Panel and Controls Connections
Page 16
PROCESSOR/SENSOR INPUT/OUTPUT MODULE (PSIO) — This module contains all the operating software needed to control the chiller. The 17EX uses 5 pressure transducers and 8 thermistors to sense pressures and temperatures. These inputs are connected to the PSIO module. The PSIO also provides outputs to the guide vane actuator, compressor and gear oil pumps, oil heater, hot gas bypass (optional), and alarm contact. The PSIO communicates with the LID, the SMM, and the optional 8-input modules for user interface and starter management.
ST ARTER MANAGEMENT MODULE (SMM) — This mod­ule is located within the starter cabinet. This module ini­tiates PSIO commands for starter functions such as start/ stop of the compressor; start/stop of the condenser and chilled water pumps; start/stop of the tower fan, spare alarm con­tacts, and the shunt trip. The SMM monitors starter inputs such as flow switches, line voltage, remote start contact, spare safety, condenser high pressure, oil pump interlock, motor current signal, starter 1M and run contacts, and the kW trans­ducer input (optional). The SMM contains logic capable of safely shutting down the chiller if communication with the PSIO is lost.
LOCALINTERFACE DEVICE (LID) — The LID is mounted to the control center and allows the operator to interface with the PSIO or other CCN devices. It is the input center for all local chiller set points, schedules, set-up functions, and op­tions. The LID has a STOP button, an alarm light, 4 buttons for logic inputs, and a display. The function of the 4 buttons or ‘‘softkeys’’ are menu driven and are shown on the display directly above the key.
SIX-PACK RELAY BOARD (6-Pack Relay Board) — This device is a cluster of 6 pilot relays located in the control center. It is energized by the PSIO for the compressor oil pump, oil heater, alarm, optional hot gas bypass relay, aux­iliary oil pump.
EIGHT-INPUT (8-Input) MODULES — One optional mod­ule is factory installed in the control center panel when or­dered. There can be up to 2 of these modules per chiller with 8 spare inputs each. They are used whenever chilled water reset, demand reset, or reading a spare sensor is required. The sensors or 4 to 20 mA signals are field-installed.
The spare temperature sensors must have the same temperature/resistance curve as the other temperature sen­sors on this unit. These sensors are rated 5,000 ohm at 75 F (25 C).
FOUR-IN/TWO-OUT(4-IN/2-OUT) MODULE —Thismod­ule monitors and controls the external gear lubrication sys­tem. It energizes the gear oil pump and is located in the power panel.
OIL HEATER CONTACTOR (1C) — This contactor is lo­cated in the power panel and operates the heater at 115 v. It is controlled by the PIC to maintain oil temperature during chiller shutdown.
COMPRESSOR OILPUMP CONTACTOR(2C)ANDGEAR OIL PUMP CONTACTOR (5C) — These contactors are lo­cated in the power panel. They operate all 200 to 575-v oil pumps. The PIC energizes the contactor to turn on the oil pumps as necessary.
HOT GAS BYPASS CONTACTOR RELAY (3C) (Optional) — This relay, located in the power panel, con­trols the opening of the hot gas bypass valve. The PIC en­ergizes the relay during low load, high lift conditions.
OIL AUXILIARY RELAY (4C) — This relay opens the oil cooler solenoid valve and interlocks the oil pump with the compressor (special order).
CONTROL TRANSFORMERS (T1-T4) — These trans­formers are located in the power panel and convert
incoming control voltage to either 21 vac power for the PSIO module and options modules, or 24 vac power for 3 power panel contactor relays and a control solenoid valve.
CONTROL AND OIL HEATER VOLTAGE SELECTOR (S1) — It is necessary to use 115 v incoming control power in the power panel. The switch must be set to the 115-v position.
OIL DIFFERENTIAL PRESSURE/POWER SUPPLY MODULE — This module, which is located in the control center, provides 5 vdc power for the transducers and LID backlight. This module outputs the difference between two pressure transducer input signals. The module subtracts oil supply pressure from transmission sump pressure and out­puts the difference as an oil differentialpressure signal to the PSIO. The PSIO converts this signal to differential oil pres­sure. To calibrate this reading, refer to the Troubleshooting, Checking Pressure Transducers section on page 84.
LID Operation and Menus (Fig. 11-17)
GENERAL
• The LID display automatically reverts to the default screen (Fig. 11) after 15 minutes if no softkey activity takes place and if the chiller is not in PUMPDOWN mode
• When not displaying the default screen, the upper right­hand corner of the LID displays the name of the screen that you have entered (Fig. 12).
• The LID may be configured in English or SI units, through the LID configuration screen.
• Local Operation — Pressing the LOCAL the PIC in LOCAL operation mode, and the control ac-
cepts modification to programming from the LID only. The PIC uses the Local Time Schedule to determine chiller start and stop times.
• CCN Operation — Pressing the CCN softkey places the PIC in the CCN operation mode, and the control accepts
modifications from any CCN interface or module (with the proper authority), as well as the LID. The PIC uses the CCN time schedule to determine start and stop times.
Fig. 11 — LID Default Screen
ALARMS AND ALERTS — An alarm (*) or alert (!) status is indicated on the default screen and the status tables. An alarm (*) shuts down the compressor. An alert (!) notifies the operator that an unusual condition has occurred. The chiller continues to operate when an alert is shown.
Alarms are indicated when the control center alarm light (!) flashes. The primary alarm message is viewed on the de­fault screen and an additional, secondary, message and troubleshooting information are sent to the ALARM HIS­TORY table.
softkey places
16
Page 17
NOTE: When an alarm is detected, the LID default screen freezes (stops updating) at the time of alarm. The freeze en­ables the operator to view the chiller conditions at the time of the alarm. The status tables show the updated informa-
tion. Once all alarms have been cleared (by pressing the
RESET
softkey), the default LID screen returns to normal
operation.
Fig. 12 — LID Service Screen
LID DEFAULT SCREEN MENU ITEMS — To perform any of the operations described below, the PIC must be pow­ered up and have successfully completed its self test.
The default screen menu selection offers four options (STATUS, SCHEDULE, SETPOINT, and SERVICE). The STATUS menu allows viewing and limited calibration/ modification of control points and sensors, relays and con­tacts, and the options board. The SCHEDULE menu allows viewing and modification of the Local Control, CCN Con­trol, and Ice Build time schedules. Numerous set points in­cluding Base Demand Limit, LCW, ECW, and Ice Build can be adjusted under the SETPOINT menu. The SERVICE menu can be used to revise alarm history, control test, control al­gorithm status, equipment configuration, equipment service, time and date, attach to network, log out of device, control­ler identification, and LID configurations. Figures 15 and 16 provide additional information on the menu structure.
Press the MENU
softkey to select from the 4 options. To view or change parameters within any menu structure, use the SELECT
softkey to choose the desired table or
item. The softkey modification choices displayed will de­pend on whether the selected item is a discrete point, ana­log point, or an override point. Press the softkey that cor­responds to your configuration selection or press the
QUIT softkey. If the QUIT softkey is depressed, the
configuration will not be modified. Use the following soft­keys to access and select the desired section.
MENU STRUCTURE — To perform any of the operations described below, the PIC must be powered up and have suc­cessfully completed its self test.
• Press MENU
to select from the four available options.
• Press NEXT or PREVIOUS to highlight the desired entry.
• Press SELECT to access the highlighted point.
• Press QUIT to leave the selected decision or field with­out saving any changes.
• Or, press ENTER to leave the selected decision or field and save changes.
TOVIEWOR CHANGE POINT STATUS (Fig. 13) — Point Status is the actual value of all of the temperatures, pres­sures, relays, and actuators sensed and controlled by the PIC.
1. On the Menu screen, press STATUS
to view the list of
Point Status tables.
2. Press NEXT or PREVIOUS to highlight the desired
status table. The list of tables is:
• STATUS01 — Status of control points and sensors
• STATUS02 — Status of relays and contacts
• STATUS03 — Status of both optional 8-input modules and sensors
• STATUS04 — Gear oil temperature and pressure
• Press the softkey that corresponds to the desired menu structure.
Fig. 13 — Example of Point Status Screen
(Status01)
17
Page 18
3. Press SELECT to view the desired Point Status table.
4. On the Point Status table press NEXT or PREVIOUS
until desired point is displayed on the screen.
Override Indication — An override value is indicated by ‘ ‘SUPVSR,’’‘‘SERVC,’’or ‘‘BEST’’ flashing next to the point value on the Status table.
TO VIEW OR CHANGE TIME SCHEDULE OPERATION (Fig. 14)
1. On the Menu screen, press SCHEDULE
.
For Discrete Points — Press START or STOP ,
or NO ,ONor OFF , etc. to select the desired
YES
state.
For Analog Points Press INCREASE or
DECREASE
to select the desired value.
5. Press ENTER to register new value.
OVERRIDE OPERATIONS NOTE: When overriding or changing metric values, it is nec-
essary to hold the softkey down for a few seconds in order to see a value change, especially on kilopascal values.
To Remove an Override
1. On the Point Status table press NEXT or PREVIOUS
to highlight the desired point.
2. Press NEXT or PREVIOUS to highlight one of the following schedules.
OCCPC01S — LOCAL Time Schedule OCCPC02S — ICE BUILD Time Schedule OCCPC03-99S — CCN Time Schedule (Actual
number is defined in CONFIG table.)
3. Press SELECT to access and view the time schedule.
4. Press NEXT or PREVIOUS to highlight the de­sired period or override that you wish to change.
5. Press SELECT to access the highlighted period or override.
2. Press SELECT to access the highlighted point.
3. Press RELEASE to remove the override and return the point to the PIC’s automatic control.
Fig. 14 — Example of Time Schedule
Operation Screen
18
Page 19
CCN
Start Chiller In CCN Control
Start Chiller In Local Control
DEFAULT SCREEN
LOCAL RESET
MENU
(SOFTKEYS)
Clear Alarms
NEXT
NEXT
START
INCREASE
ENABLE
STATUS
List the Status Tables
STATUS STATUS STATUS STATUS
PREVIOUS
PREVIOUS
STOP RELEASE
DECREASE
DISABLE
SCHEDULE SETPOINT
01 02 03 04
SELECT
SELECT
RELEASE
RELEASE
Access Main Menu
SERVICE
EXIT
EXIT
ENTER
ENTER
ENTER
(SELECT A T ABLE) (SELECT A POINT
ON THE TABLE) (MODIFY A
DISCRETE POINT) or (MODIFY AN
ANALOG POINT) or (MODIFY CONTROL
OPTIONS)
Select a Schedule
NEXT
Select a Time Period/Override
NEXT
Modify a Schedule Time
INCREASE
Add/Eliminate a Day
ENABLE
123
List the Schedules
OCCPC01S - Local Time Schedule OCCPC02S - Ice Build Time Schedule OCCPC03S-99S - CCN Time Schedule
(ENTER A 4-DIGIT PASSWORD)
4
Select the Setpoint
Modify the Setpoint
1 2 3 4 5 6 7 8
Override
SELECT
SELECT
ENTER
ENTER
PREVIOUS
PREVIOUS
DECREASE
DISABLE
Display the Setpoint Table
NEXT
INCREASE
Base Demand Limit
LCW Setpoint
ECW Setpoint
Ice Build Setpoint
PREVIOUS
DECREASE
EXIT
EXIT
EXIT
EXIT
(ANALOG VALUES)
(DISCRETE VALUES)
List the Service Tables
SELECT
QUIT
EXIT
ENTER
Select a Service Table
NEXT
Fig. 15 — 17EX LID Menu Structure
19
• ALARM HISTORY
• CONTROL TEST
• CONTROL ALGORITHM STATUS
• EQUIPMENT CONFIGURATION
• EQUIPMENT SERVICE
• TIME AND DATE
• ATTACH TO NETWORK DEVICE
• LOG OUT OF DEVICE
• CONTROLLER IDENTIFICATION
• LID CONFIGURATION
PREVIOUS
SEE FIGURE 16
SELECT
EXIT
Page 20
SERVICE TABLE
NEXT
PREVIOUS
ALARM HISTORY
CONTROL TEST
CONTROL ALGORITHM STA TUS
List the Control Algorithm Status Tables
MAINT01 (Capacity Control) MAINT02 (Override Status) MAINT03 (Surge/HGBP Status) MAINT04 (Lead/Lag Status) WSMDEFME (Water System Manager Control Status) OCCDEFM (Time Schedule Status)
SELECT
Display Alarm History
(The table holds up to 25 alarms and alerts with the last alarm at the top of the screen.)
EXIT
List the Control Tests
Select a Test
NEXT
Automated T est
PSIO Thermistors
Options Thermistor
Transducers
Guide Vane Actuator
Pumps
Discrete Outputs
Pumpdown Lockout
Terminated Lockout
• FX Gear Oil Pump I/O
PREVIOUS
SELECT
EXIT
Select a Table:
NEXT
OCCDEFM (Time Schedule Status)
Data Select Table
NEXT
EQUIPMENT CONFIGURATION List the Equipment Configuration Tables
PREVIOUS
PREVIOUS
OCCPC01S (Local Status) OCCPC02S (CCN, ICE BUILD Status) OCCPC03S (CCN Status)
SELECT
SELECT
EXIT
MAINT01 (Capacity Control Algorithm) MAINT02 (Override Status)\ MAINT03 (Surge/HGBP Status) MAINT04 (LEAD/LAG Status) WSMDEFM2 (Water System Manager Control Status)
EXIT
Maintenance T able Data
• CONFIG
• LEAD/LAG
• OCCDEFCS
• HOLIDEF
• BRODEF
• WSMALMDF
• ALARMDEF
• CONS_DEF
• RUNT_DEF
Select a Table
NEXT
PREVIOUS
SELECT
EXIT
CONTINUED ON NEXT PAGE
Select a Parameter
NEXT
Modify a Parameter
INCREASE
ENABLE
YES
PREVIOUS
DECREASE
DISABLE
NO
Fig. 16 — 17EX Service Menu Structure
20
SELECT
QUIT QUIT QUIT
EXIT
ENTER ENTER ENTER
(ANALOG VALUES)
(DISCRETE VALUES)
(DISCRETE VALUES)
Page 21
SERVICE MENU CONTINUED FROM PREVIOUS PAGE
EQUIPMENT SERVICE (See Table 2, Examples 8, 9, and 10)
Service Tables: (See Note)
SERVICE1
SERVICE2
SERVICE3
Select a Service Table
NEXT
Select a Service Table Parameter
NEXT
Modify a Service Table Parameter
INCREASE
ENABLE
NO
TIME AND DATE
ATTACH TO NETWORK DEVICE
Select a Device
NEXT
Modify Device Address
INCREASE
Use to attach LID to another CCN network or device
Attach to "LOCAL" to enter this machine
To upload new tables
PREVIOUS
PREVIOUS
DECREASE
DISABLE
YES
List Network Devices
Local
• Device 1
• Device 2
• Device 3
• Device 4
• Device 5
PREVIOUS
DECREASE
SELECT
SELECT
QUIT QUIT QUIT
• Device 6
• Device 7
• Device 8
• Device 9
SELECT
ENTER
EXIT
EXIT
ENTER ENTER ENTER
ATTACH
EXIT
(ANALOG VALUES) (DISCRETE VALUES) (DISCRETE VALUES)
Display Time and Date Table:
To Modify — Time — Day of Week
INCREASE
DECREASE
— Date — Holiday Today
ENTER
EXIT
LOG OUT OF DEVICE
CONTROLLER IDENTIFICATION PSIO Controller
Identification Table
INCREASE
To modify — PSIO CCN Address • To View — PSIO Software Version
LID CONFIGURATION
DECREASE
LEGEND
CCN Carrier Comfort Network HGBP — Hot Gas Bypass LID Local Interface Device
NOTE: SERVICE TABLES:
SERVICE1: — Capacity Override
Type of Chilled MediumAlert TemperatureFlow VerificationDeadbandRecycle Restart TimeSurge/HGBP OperationMotor Voltage, RLA, and FrequencyStarter TypeCondenser Freeze SafetySoft Stop ConfigurationStart to Stop TimerGear Oil Pump Configuration
ENTER
Default Screen
CCN
EXIT
(last 2 digits on part number indicate software version)
LID Configuration Table
INCREASE
To Modify — LID CCN Address
LOCAL
DECREASE
— English or S.I. Metric Units — Password
RESET
ENTER
SERVICE2: — 8-input Modules
SERVICE3: — Proportional Inc each Band
MENU
20 mA Power Source
Proportional Dec each BandProportional ECW GainMaximum Guide Vane Opening
EXIT
To View — LID Software Version (last 2 digits of part number
indicate software version)
Fig. 16 — 17EX Service Menu Structure (cont)
21
Page 22
6. a. Press INCREASE or DECREASE to change the time values. Override values are in one-hour incre-
ments, up to 4 hours.
b. Press ENABLE to select days in the day-of-week
fields. Press DISABLE
to eliminate days from the
period.
7. Press ENTER to register the values and to move horizontally (left to right) within a period.
8. Press EXIT to leave the period or override.
9. Either return to Step 4 to select another period or override, or press EXIT
again to leave the cur-
rent time schedule screen and save the changes.
4. Press SELECT to modify the highlighted set point.
5. Press INCREASE or DECREASE to change the se­lected set point value.
6. Press ENTER to save the changes and return to the previous screen.
10. Holiday Designation (HOLIDEF table) may be found in the Service Operation section, page 42.You must assign the month, day, and duration for the holiday.The Broad­cast function in the BRODEF table also must be en­abled for holiday periods to function.
TO VIEW AND CHANGE SET POINTS (Fig. 17)
1. To view the Set Point table, at the Menu screen press
SETPOINT
.
2. There are 4 set points on this screen: Base Demand Limit;
LCW Set Point (leaving chilled water set point); ECW Set Point (entering chilled water set point); and ICE BUILD set point. Only one of the chilled water set points can be active at one time, and the type of set point is activated in the Service menu. ICE BUILD is also activated and configured in the Service menu.
3. Press NEXT or PREVIOUS to highlight the desired
set point entry.
Fig. 17 — Example of Set Point Screen
SERVICE OPERATION — To view the menu-driven pro­grams available for Service Operation, see the Service Op­eration section, page 42. For examples of LID display screens, see Table 2.
LEGEND FOR TABLE 2 — LID DISPLAY DATA
CCN Carrier Comfort Network CHWR — Chilled Water Return CHWS — Chilled Water Supply Compr — Compressor Dec Decrease Ecw Entering Chilled Water HGBP — Hot Gas Bypass Inc Increase LCW Leaving Chilled Water mA Milliamps P—Pressure PIC Product Integrated Controls Refrig — Refrigerant T—Temperature Temp Temperature
22
Page 23
Table 2 — LID Display Data
NOTES:
IMPORTANT: The following notes apply to all Table 2 examples.
1. Only 12 lines of information appear on the LID screen at any one time. Pressthe NEXT or to view items below or above the current screen. If you have a chiller with a backlit LID, press the NEXT forward; press the PREVIOUS
2. Toaccess the information shown in Examples 6 through 14, enter your 4-digit password after pressing the SERVICE
softkeys arepressed for 15 minutes, the LIDautomatically logs off (to prevent unrestricted access to PIC controls) and reverts to the default screen. If this happens, you must reenter your password to access the tables shown in Examples 6 through 14.
3. Termsin the Description column of these tables are listed as they appear on the LID screen.
4. The LID may be configured in English or Metric (SI) units using theLIDCONFIGURATIONscreen. See the ServiceOperation sec­tion, page 42, for instructions on making this change.
To access this display from the LID default screen:
1. Press MENU
2. Press STATUS
3. Press SELECT
or PREVIOUS softkey to highlightapoint
softkey twice to page
softkey twice to page back.
softkey.If no
EXAMPLE1—STATUS01 DISPLAY SCREEN
. (STATUS01 will be highlighted).
.
5. The items in the Reference Point Name column
the LID screen
Building Supervisor software. They are listed in these tables as a convenience to the operator if it is necessary to cross reference CCN/BS documentation or use CCN/BS programs. For more in­formation, see the 17EX CCN literature.
6. Reference Point Names shown in these tables in all capital letters can be read by CCN and Building Supervisor software. Of these capitalized names, those preceded by an asterisk can also be changed (that is, written to) by the CCN, Building Supervisor soft­ware and the LID. Capitalized Reference Point Names preceded by two asterisks can be changed only from the LID. Reference Point Names in lower case type can be viewed by CCN or Build­ing Supervisor software only by viewing the whole table.
7. Alarms and Alerts: An asterisk
screen
tion point in the far right field of the LID screen indicates an alert state. The asterisk (or exclamation point) indicates that the value on that line has exceeded (or is approaching) a limit. For more information on alarms and alerts, see the Alarms and Alerts sec­tion, page 16.
. They are data or variable names used in CCN or
in the far right field of a LID status
indicates that the chiller is in an alarm state; an exclama-
do not appear on
DESCRIPTION RANGE UNITS
Control Mode Reset.Off. Local. CCN MODE Run Status Timeout. Recycle. Startup. STATUS
Occupied ? No/Yes OCC Alarm State Normal/Alarm ALM *Chiller Start/Stop Stop/Start CHIL S S Base Demand Limit 40-100 % DLM *Active Demand Limit 40-100 % DEM LIM Compressor Motor Load 0-999 % CA L
Current 0-999 % CA P
Amps 0-9999 AMPS CA A *Target Guide Vane Pos 0-100 % GV TRG Actual Guide Vane Pos 0-100 % GV ACT Water/Brine: Setpoint 10-120 (–12.2-48.9) DEG F (DEG C) SP * Control Point 10-120 (–12.2-48.9) DEG F (DEG C) LCW STPT Entering Chilled Water –40-245 (–40-118) DEG F (DEG C) ECW Leaving Chilled Water –40-245 (–40-118) DEG F (DEG C) LCW Entering Condenser Water –40-245 (–40-118) DEG F (DEG C) ECDW Leaving Condenser Water –40-245 (–40-118) DEG F (DEG C) LCDW Evaporator Refrig Temp –40-245 (–40-118) DEG F (DEG C) ERT Evaporator Pressure –6.7-420 (–46-2896) PSI (kPa) ERP Condenser Refrig Temp –40-245 (–40-118) DEG F (DEG C) CRT Condenser Pressure –6.7-420 (–46-2896) PSI (kPa) CRP Discharge Temperature –40-245 (–40-118) DEG F (DEG C) CMPD Bearing Temperature –40-245 (–40-118) DEG F (DEG C) MTRB Motor Winding Temp† –40-245 (–40-118) DEG F (DEG C) MTRW Motor Winding Hi
Temp Cutout
Oil Sump Temperature –40-245 (–40-118) DEG F (DEG C) OILT Oil Pressure Transducer† –6.7-420 (–46-2896) PSI (kPa) OILP Oil Pressure** –6.7-420 (–46-2896) PSID (kPad) OILPD Line Voltage: Percent 0-999 % V P
*Remote Contacts Input Off/On REMCON Total Compressor Starts 0-65535 c starts Starts in 12 Hours 0-8 STARTS Compressor Ontime 0-500000.0 HOURS c hrs *Service Ontime 0-32767 HOURS S HRS *Compressor Motor kW 0-9999 kW CKW
†Information is applicable to hermetic chillers (19EX) only.
**Oil pressure is read directly from a differential pressure module on 17EX chillers. NOTE: values preceded by an asterisk (*) can be forced (changed by an operator) from the LID screen
or from another control device (such as a Carrier Comfort Network [CCN] terminal).
Actual 0-9999 VOLTS V A
Ramping. Running. Demand. Override. Shutdown. Abnormal. Pumpdown
Normal/Alarm MTRW
REFERENCE POINT NAME
(ALARM HISTORY)
23
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EXAMPLE2—STATUS02 DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press STATUS
3. Scroll down to highlight STATUS02.
4. Press SELECT
.
.
.
Table 2 — LID Display Data (cont)
DESCRIPTION
Hot Gas Bypass Relay X OFF/ON HGBR *Chilled Water Pump X OFF/ON CHWP Chilled Water Flow X NO/YES EVFL *Condenser Water Pump X OFF/ON CDP Condenser Water Flow X NO/YES CDFL Compressor Start Relay X OFF/ON CMPR Compressor Start Contact X OPEN/CLOSED 1CR AUX Compressor Run Contact X OPEN/CLOSED RUN AUX Starter Fault Contact X OPEN/CLOSED STR FLT Pressure Trip Contact X OPEN/CLOSED PRS TRIP Single Cycle Dropout X NORMAL/ALARM V1 CYCLE Oil Pump Relay X OFF/ON OILR Oil Heater Relay X OFF/ON OILH Motor Cooling Relay† X OFF/ON MTRC Auxiliary Oil Pump Relay X OFF/ON AUXOILR *Tower Fan Relay X OFF/ON TFR Compr. Shunt Trip Relay X OFF/ON TRIPR Alarm Relay X NORMAL/ALARM ALM Spare Prot Limit Input X ALARM/NORMAL SPR PL
†Information is applicable to hermetic machines only. NOTE: values preceded by an asterisk (*) can be forced (changed by an operator) from the LID screen
or from another control device (such as a Carrier Comfort Network [CCN] terminal).
To access this display from the LID default screen:
1. Press MENU
2. Press STATUS
3. Scroll down to highlight STATUS03.
4. Press SELECT
.
.
.
POINT TYPE
INPUT OUTPUT
EXAMPLE3—STATUS03 DISPLAY SCREEN
UNITS
REFERENCE POINT NAME
(ALARM HISTORY)
DESCRIPTION RANGE UNITS
OPTIONS BOARD 1 *Demand Limit 4-20 mA 4-20 mA DEM OPT
*Temp Reset 4-20 mA 4-20 mA RES OPT *Common CHWS Sensor –40-245 (–40-118) DEG F (DEG C) CHWS *Common CHWR Sensor –40-245 (–40-118) DEG F (DEG C) CHWR *Remote Reset Sensor –40-245 (–40-118) DEG F (DEG C) R RESET *Temp Sensor — Spare 1 –40-245 (–40-118) DEG F (DEG C) SPARE1 *Temp Sensor — Spare 2 –40-245 (–40-118) DEG F (DEG C) SPARE2 *Temp Sensor — Spare 3 –40-245 (–40-118) DEG F (DEG C) SPARE3
OPTIONS BOARD 2 *4-20 mA — Spare 1 4-20 mA SPARE1 M
*4-20 mA — Spare 2 4-20 mA SPARE2 M *Temp Sensor — Spare 4 –40-245 (–40-118) DEG F (DEG C) SPARE4 *Temp Sensor — Spare 5 –40-245 (–40-118) DEG F (DEG C) SPARE5 *Temp Sensor — Spare 6 –40-245 (–40-118) DEG F (DEG C) SPARE6 *Temp Sensor — Spare 7 –40-245 (–40-118) DEG F (DEG C) SPARE7 *Temp Sensor — Spare 8 –40-245 (–40-118) DEG F (DEG C) SPARE8 *Temp Sensor — Spare 9 –40-245 (–40-118) DEG F (DEG C) SPARE9
NOTE: values preceded by an asterisk (*) can be forced (changed by an operator) from the LID screen or from another control device (such as a Carrier Comfort Network [CCN] terminal).
REFERENCE POINT NAME
(ALARM HISTORY)
24
Page 25
EXAMPLE4—STATUS04 DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press STATUS
3. Scroll down to highlight STATUS04.
4. Press SELECT
.
.
.
Table 2 — LID Display Data (cont)
DESCRIPTION RANGE UNITS
Main Gear Oil Pump OFF/ON MAINPMP1 Auxiliary Gear Oil Pump OFF/ON AUXPMP2 Gear Oil Pressure −6.7 to 420 (−46 to 2896) psi (kPa) GEAROILP Gear Oil Temperature −40 to 245 (−40 to 118) DEG F (DEG C) GEAROILT
EXAMPLE 5 — SETPOINT DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press SETPOINT
DESCRIPTION CONFIGURABLE RANGE UNITS REFERENCE POINT NAME DEFAULT VALUE
Base Demand Limit 40-100 % DLM 100 LCW Setpoint 20-120 (–6.7-48.9) DEG F (DEG C) lcw sp ECW Setpoint 20-120 (–6.7-48.9) DEG F (DEG C) ecw sp 60.0 (15.6) ICE BUILD Setpoint 20- 60 (–6.7-15.6) DEG F (DEG C) ice sp
.
.
REFERENCE POINT NAME
(ALARM HISTORY)
50.0 (10.0)
40.0 ( 4.4)
25
Page 26
Table 2 — LID Display Data (cont)
EXAMPLE 6 — CONFIGURATION (CONFIG) DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press SERVICE
3. Scroll down to highlight EQUIPMENT CONFIGURATION.
4. Press SELECT
5. Scroll down to highlight CONFIG.
6. Press SELECT
DESCRIPTION CONFIGURABLE RANGE UNITS REFERENCE POINT NAME DEFAULT VALUE
RESET TYPE 1 Degrees Reset at 20 mA –30-30 (–17-17) DEG F (DEG C) deg 20ma
RESET TYPE 2 Remote Temp (No Reset) –40-245 (–40-118) DEG F (DEG C) res rt1 Remote Temp (Full Reset) –40-245 (–40-118) DEG F (DEG C) res rt2 65 (18) Degrees Reset –30-30 (–17-17) DEG F (DEG C) res rt 10D(6D)
RESET TYPE 3 CHW Delta T (No Reset) 0-15 (0-8) DEG F (DEG C) restd 1 CHW Delta T (Full Reset) 0-15 (0-8) DEG F (DEG C) restd 2 0D(0D) Degrees Reset –30-30 (–17-17) DEG F (DEG C) deg chw 5D(3D)
Select/Enable Reset Type 0-3 res sel ECW CONTROL OPTION DISABLE/ENABLE ecw opt
Demand Limit At 20 mA 40-100 % dem 20ma 40 20 mA Demand Limit Option DISABLE/ENABLE dem sel DISABLE
Auto Restart Option DISABLE/ENABLE astart DISABLE Remote Contacts Option DISABLE/ENABLE r contact Temp Pulldown Deg/Min 2-10 tmp ramp
Load Pulldown %/Min 5-20 kw ramp 10 Select Ramp Type: 0/1 ramp opt 1
Temp=0,Load=1
Loadshed Group Number 0-99 ldsgrp 0 Loadshed Demand Delta 0-60 % ldsdelta 20 Maximum Loadshed Time 0-120 MIN maxldstm 60
CCN Occupancy Config:
Schedule Number 3-99 occpcxxe 3 Broadcast Option DISABLE/ENABLE occbrcst DISABLE
ICE BUILD Option DISABLE/ENABLE ibopt DISABLE ICE BUILD TERMINATION
0 =Temp, 1 =Contacts, 2 =Both 0-2 ibterm 0
ICE BUILD Recycle Option DISABLE/ENABLE ibrecyc DISABLE
NOTE: D = delta degrees.
.
.
.
.
10D(6D) 85 (29)
10D(6D)
0 DISABLE
DISABLE 3
26
Page 27
Table 2 — LID Display Data (cont)
EXAMPLE 7 — LEAD/LAG CONFIGURATION DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press SERVICE
3. Scroll down to highlight EQUIPMENT CONFIGURATION.
4. Press SELECT
5. Scroll down to highlight LEAD/LAG.
6. Press SELECT
DESCRIPTION CONFIGURABLE RANGE UNITS REFERENCE POINT NAME DEFAULT VALUE
LEAD/LAG SELECT
DISABLE =0, LEAD =1, LAG =2, STANDBY =3
Load Balance Option DISABLE/ENABLE loadbal DISABLE Common Sensor Option DISABLE/ENABLE commsens DISABLE LAG Percent Capacity 25-75 % lag per LAG Address 1-236 lag add LAG START Timer 2-60 MIN lagstart 10 LAG STOP Timer 2-60 MIN lagstop 10 PRESTART FAULT Timer 0-30 MIN preflt 5 STANDBY Chiller Option DISABLE/ENABLE stndopt DISABLE STANDBY Percent Capacity 25-75 % stnd per STANDBY Address 1-236 stnd add
.
.
.
.
LEAD/LAG CONFIGURATION SCREEN
0-3 leadlag 0
50 92
50 93
27
Page 28
Table 2 — LID Display Data (cont)
EXAMPLE 8 — SERVICE1 DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press SERVICE
3. Scroll down to highlight EQUIPMENT SERVICE.
4. Press SELECT
5. Scroll down to highlight SERVICE1.
6. Press SELECT
DESCRIPTION CONFIGURABLE RANGE UNITS REFERENCE POINT NAME DEFAULT VALUE
Motor Temp Override* 150-200 (66-93) DEG F (DEG C) mt over Cond Press Override 90-200 (620-1379) PSI (kPa) cp over Refrig Override Delta T 2-5 (1-3) DEG F (DEG C) ref over 3D (1.6D) Chilled Medium Water/Brine medium WATER Brine Refrig Trippoint 8-40 (–13.3-4) DEG F (DEG C) br trip
Compr Discharge Alert 125-200 (52-93) DEG F (DEG C) cd alert Bearing Temp Alert 165-210 (74-99) DEG F (DEG C) tb alert 175 (79)
Water Flow Verify Time 0.5-5 MIN wflow t Oil Press Verify Time 15-300 SEC oilpr t 15
Water/Brine Deadband 0.5-2.0 (0.3-1.1) DEG F (DEG C) cw db Recycle Restart Delta T 2.0-10.0 (1.1-5.6) DEG F (DEG C) rcycrdt 5 (2.8) Recycle Shutdown Delta 0.5-4.0 (.27-2.2) rcycsdt 1.0 (0.6) Surge Limit/HGBP Option 0/1 srg hgbp Select: Surge=0, HGBP=1 Surge/HGBP Delta T1 0.5-15 (0.3-8.3) DEG F (DEG C) hgb dt1 Surge/HGBP Delta P1 30-170 (207-1172) PSI (kPa) hgb dp1 50 (345) Min. Load Points (T1/P1) Surge/HGBP Delta T2 0.5-15 (0.3-8.3) DEG F (DEG C) hgb dt2 Surge/HGBP Delta P2 30-170 (207-1172) PSI (kPa) hgb dp2 85 (586) Full Load Points (T2/P2) Surge/HGBP Deadband 1-3 (0.6-1.6) DEG F (DEG C) hgb dp
Surge Delta Percent Amps 10-50 % surge a Surge Time Period 1-5 MIN surge t 2
Demand Limit Source 0/1 dem src Select: Amps=0, Load=1 Amps Correction Factor 1-8 corfact 3 Motor Rated Load Amps 1-9999 AMPS a fs Motor Rated Line Voltage 1-9999 VOLTS v fs 460 Meter Rated Line kW 1-9999 kW kw fs 600
Line Frequency 0/1 HZ freq 0 Select: 0=60 Hz, 1=50 Hz
Compr Starter Type REDUCE/FULL starter REDUCE Condenser Freeze Point –20-35 (–28.9-1.7) DEG F (DEG C) cdfreeze 34 (1) Soft Stop Amps Threshold 40-100 % softstop 100 Stop to Start Timer 3-50 MIN stopmtr 20
External Gear Option ENABLE/DSABLE exg opt Mechanical Gear Oil Pump ENABLE/DSABLE mech pmp DSABLE Auxiliary Gear Oil Pump ENABLE/DSABLE aux pmp Gear Oil Pressure Alert 15-20 (103-138) PSI (kPa) gearp al 15 (103) Gear Oil Temperature Alert 130-145 (54-63) DEG F (DEG C) geart al 130 (54)
*Information is applicable to hermetic machines (19EX) only. NOTE: D = delta degrees.
.
.
.
.
200 (93) 125 (862)
33 (1) 200 (93)
5
1.0 (0.6)
0
1.5 (0.8)
10 (5.6)
1 (0.6) 25
0
200
ENABLE DSABLE
28
Page 29
Table 2 — LID Display Data (cont)
EXAMPLE 9 — SERVICE2 DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press SERVICE
3. Scroll down to highlight EQUIPMENT SERVICE.
4. Press SELECT
5. Scroll down to highlight SERVICE2.
6. Press SELECT
OPTIONS BOARD 1 20 mA POWER CONFIGURATION
External = 0, Internal = 1 RESET 20 mA Power Source 0,1 res 20 ma
DEMAND 20 mA Power Source 0,1 dem 20 ma 0 SPARE ALERT ENABLE
Disable = 0, 1 = High Alert, 2 = Low Alert, 3 = High Alarm, 4 = Low Alarm Temp = Alert Threshold
CHWS Temp Enable 0-4 chws en CHWS Temp Alert –40-245 (–40-118) DEG F (DEG C) chws al 245 (118) CHWR Temp Enable 0-4 chwr en 0 CHWR Temp Alert –40-245 (–40-118) DEG F (DEG C) chwr al Reset Temp Enable 0-4 rres en 0 Reset Temp Alert –40-245 (–40-118) DEG F (DEG C) rres al 245 (118) Spare Temp 1 Enable 0-4 spr1 en Spare Temp 1 Alert –40-245 (–40-118) DEG F (DEG C) spr1 al 245 (118) Spare Temp 2 Enable 0-4 spr2 en 0 Spare Temp 2 Alert –40-245 (–40-118) DEG F (DEG C) spr2 al Spare Temp 3 Enable 0-4 spr3 en 0 Spare Temp 3 Alert –40-245 (–40-118) DEG F (DEG C) spr3 al
OPTIONS BOARD 2 20 mA POWER CONFIGURATION
External = 0, Internal = 1 SPARE 1 20 mA Power Source 0,1 sp1 20 ma SPARE 2 20 mA Power Source 0,1 sp2 20 ma 0
SPARE ALERT ENABLE Disable = 0, 1 = High Alert, 2 = Low Alert, 3 = High Alarm, 4 = Low Alarm Temp = Alert Threshold
Spare Temp 4 Enable 0-4 spr4 en Spare Temp 4 Alert –40-245 (–40-118) DEG F (DEG C) spr4 al 245 (118) Spare Temp 5 Enable 0-4 spr5 en 0 Spare Temp 5 Alert –40-245 (–40-118) DEG F (DEG C) spr5 al Spare Temp 6 Enable 0-4 spr6 en 0 Spare Temp 6 Alert –40-245 (–40-118) DEG F (DEG C) spr6 al Spare Temp 7 Enable 0-4 spr7 en 0 Spare Temp 7 Alert –40-245 (–40-118) DEG F (DEG C) spr7 al 245 (118) Spare Temp 8 Enable 0-4 spr8 en Spare Temp 8 Alert –40-245 (–0-118) DEG F (DEG C) spr8 al 245 (118) Spare Temp 9 Enable 0-4 spr9 en 0 Spare Temp 9 Alert –40-245 (–40-118) DEG F (DEG C) spr9 al
NOTE: This screen provides the means to generate alert messages based on exceeding the ‘‘Temp’’threshold for each point listed. If the ‘‘Enable’’ is set to 1, a value above the ‘‘Temp’’ threshold generates an alert message. If the ‘‘Enable’’ is set to 2, a value below the ‘‘Temp Alert’’ threshold generates an alert message. If the ‘‘Enable’’ is set to 0, alert generation is disabled. If the ‘‘Enable’’ is set to 3, a value above the ‘‘Temp’’ threshold generates an alarm. If the ‘‘Enable’’ is set to 4, a value below the ‘‘Temp’’ threshold generates an alarm.
.
.
.
.
DESCRIPTION CONFIGURABLE RANGE UNITS REFERENCE POINT NAME DEFAULT VALUE
0
0
245 (118)
0
245 (118) 245 (118)
0
0
245 (118) 245 (118)
0
245 (118)
EXAMPLE 10 — SERVICE3 DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press SERVICE
3. Scroll down to highlight EQUIPMENT SERVICE.
4. Press SELECT
5. Scroll down to highlight SERVICE3.
DESCRIPTION CONFIGURABLE RANGE UNITS REFERENCE POINT NAME DEFAULT VALUE
Proportional Inc Band 2-10 gv inc Proportional Dec Band 2-10 gv de 6.0 Proportional ECW Gain 1-3 gv ecw 2.0
Guide Vane Travel Limit 30-100 % gv lim
.
.
.
29
6.5
50
Page 30
Table 2 — LID Display Data (cont)
EXAMPLE 11 — MAINTENANCE (MAINT01) DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press SERVICE
3. Scroll down to highlight CONTROL ALGORITHM STATUS.
4. Press SELECT
5. Scroll down to highlight MAINT01.
DESCRIPTION RANGE/STATUS UNITS REFERENCE POINT NAME
CAPACITY CONTROL Control Point 10-120 (–12.2-48.9) DEG F (DEG C) ctrlpt Leaving Chilled Water –40-245 (–40-118) DEG F (DEG C) LCW Entering Chilled Water –40-245 (–40-118) DEG F (DEG C) ECW Control Point Error –99-99 (–55-55) DEG F (DEG C) cperr ECW Delta T –99-99 (–55-55) DEG F (DEG C) ecwdt ECW Reset –99-99 (–55-55) DEG F (DEG C) ecwres LCW Reset –99-99 (–55-55) DEG F (DEG C) lcwres Total Error + Resets –99-99 (–55-55) DEG F (DEG C) error Guide Vane Delta –2-2 % gvd Target Guide Vane Pos 0-100 % GV TRG Actual Guide Vane Pos 0-100 % GV ACT
Proportional Inc Band 2-10 gv inc Proportional Dec Band 2-10 gv dec Proportional ECW Gain 1-3 gv ecw Water/Brine Deadband 0.5-2 (0.3-1.1) DEG F (DEG C) cwdb
NOTE: Overriding is not supported on this maintenance screen.Active overrides show the associated point in alert (*). Reference point names with capital letters can be read by CCN and Building Supervisor software.
.
.
.
EXAMPLE 12 — MAINTENANCE (MAINT02) DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press SERVICE
3. Scroll down to highlight CONTROL ALGORITHM STATUS.
4. Press SELECT
5. Scroll down to highlight MAINT02.
6. Press SELECT
OVERRIDE/ALERT STATUS MOTOR WINDING TEMP† –40-245 (–40-118) DEG F (DEG C) MTRW
Override Threshold 150-200 (66-93) DEG F (DEG C) mt over CONDENSER PRESSURE –6.7-420 (–42-2896) PSI (kPa) CRP Override Threshold 90-245 (621-1689) PSI (kPa) cp over EVAPORATOR REFRIG TEMP –40-245 (–40-118) DEG F (DEG C) ERT Override Threshold 2-45 (1-7.2) DEG F (DEG C) rt over DISCHARGE TEMPERATURE –40-245 (–40-118) DEG F (DEG C) CMPD Alert Threshold 125-200 (52-93) DEG F (DEG C) cd alert BEARING TEMPERATURE –40-245 (–40-118) DEG F (DEG C) MTRB Alert Threshold 175-185 (79-85) DEG F (DEG C) tb alert
†Information is applicable to hermetic machines (19EX) only. NOTE: Overriding is not supported on this maintenance screen.Active overrides show the associated point in alert (*). Reference point names with
capital letters can be read by CCN and Building Supervisor software.
.
.
.
.
DESCRIPTION RANGE/STATUS UNITS REFERENCE POINT NAME
30
Page 31
Table 2 — LID Display Data (cont)
EXAMPLE 13 — MAINTENANCE (MAINT03) DISPLAY SCREEN
To access this display from the LID default screen:
1. Press MENU
2. Press SERVICE
3. Scroll down to highlight CONTROL ALGORITHM STATUS.
4. Press SELECT
5. Scroll down to highlight MAINT03.
6. Press SELECT
SURGE/HGBP ACTIVE ? NO/YES Active Delta P 0-200 (0-1379) PSI (kPa) dp a
Active Delta T 0-200 (0-111) DEG F (DEG C) dt a Calculated Delta T 0-200 (0-111) DEG F (DEG C) dt c
Surge Protection Counts 0-12 spc
NOTE: Override is not supported on this maintenance screen. Only values with capital letter reference point names are variables available for read operation.
To access this display from the LID default screen:
1. Press MENU
2. Press SERVICE
3. Scroll down to highlight CONTROL ALGORITHM STATUS.
4. Press SELECT
5. Scroll down to highlight MAINT04.
6. Press SELECT
.
.
.
.
DESCRIPTION RANGE/STATUS UNITS REFERENCE POINT NAME
EXAMPLE 14 — MAINTENANCE (MAINT04) DISPLAY SCREEN
.
.
.
.
DESCRIPTION RANGE/STATUS UNITS REFERENCE POINT NAME
LEAD/LAG: Configuration DISABLE,LEAD,LAG,STANDBY, INVALID leadlag Load Balance Option DISABLE/ENABLE loadbal
LAG Start Time 0-60 MIN lagstart LAG Stop Time 0-60 MIN lagstop Prestart Fault Time 0-30 MIN preflt Pulldown: Delta T/Min x.xx D DEGF(DDEG C) pull dt
LEAD CHILLER in Control No/Yes leadctrl LAG CHILLER: Mode Reset,Off,Local,CCN lagmode
STANDBY CHILLER: Mode Reset,Off,Local,CCN stdmode
NOTES:
1. Values on this screen cannot be ‘‘forced’’ (that is, changed by an operator, from the LID or from any other device [such as a CCN terminal]).
2. D = delta degrees.
Current Mode DISABLE,LEAD,LAG,STANDBY, CONFIG llmode
Satisfied? No/Yes pull sat
Run Status Timeout,Recycle,Startup,Ramping,Running Start/Stop Stop,Start,Retain lag s s
Recovery Start Request No/Yes lag rec
Run Status Timeout,Recycle,Startup,Ramping,Running
Recovery Start Request No/Yes std rec
Start/Stop Stop,Start,Retain std s s
Demand,Override,Shutdown,Abnormal,Pumpdown
Demand,Override,Shutdown,Abnormal,Pumpdown
lagstat
stdstat
31
Page 32
PIC System Functions
NOTE: In the rest of this manual, words not part of para­graph headings and printed in all capital letters can be viewed on the LID (e.g., LOCAL, CCN, RUNNING, ALARM, etc.). Words printed both in capital letters and italics can also be viewed on the LID and are parameters (CONTROL MODE, COOLING SETPOINT,OVERRIDE THRESHOLD, etc.) with associated values (e.g., modes, temperatures, pressures, per­centages, on, off, etc.). Words printed in all capital letters and in a box represent softkeys on the LID control panel
(e.g., ENTER the information that can appear on the LID screens. Figures 11-17 give an overview of LID operation and menus.
CAPACITY CONTROL — The PIC controls the chiller ca­pacity by modulating the inlet guide vanes in response to chilled water temperature changes away from the WATER/
BRINE CONTROL POINT. The WATER/BRINE CONTROL POINT may be changed by a CCN network device or is de-
termined when the PIC adds any active chilled water reset to the chilled water SET POINT. The PIC uses the PROPOR-
TIONAL INC (Increase) BAND, PROPORTIONAL DEC (Decrease) BAND, and the PROPORTIONAL ECW (Enter­ing Chilled Water)GAIN to determine how quickly or slowly
to respond. WATER/BRINE CONTROL POINT may be viewed/ overridden from the STATUS menu, STATUS01 screen.
ENTERING CHILLED WATER CONTROL — If this op­tion is enabled, the PIC uses the ENTERING CHILLED WA-
TER temperature to modulate the vanes instead of theLEAVING CHILLED WATER temperature. The ENTERING CHILLED WATER control option may be viewed/modified from the
CONFIG screen, accessed from the EQUIPMENT CON­FIGURATION table.
DEADBAND — This is the tolerance on the chilled water/ brine temperature WATER/BRINE CONTROL POINT. If the water temperature goes outside the WATER/BRINE DEAD- BAND, the PIC opens or closes the guide vanes in response until it is within tolerance. The PIC may be configured with a 0.5° to 2° F (0.3° to 1.1° C) deadband. WATER/BRINE DEADBAND may be viewed or modified from the SERVICE1 screen, accessed from the EQUIPMENT SERVICE table.
For example, a 1° F (0.6° C) deadband setting controls the water temperature within ±0.5° F (0.3° C) of the control point. This may cause frequent guide vane movement if the chilled water load fluctuates frequently. A value of 1° F (0.6° C) is the default setting.
PROPORTIONALBANDSAND GAIN — Proportional band is the rate at which the guide vane position is corrected in proportion to how far the chilled water/brine temperature is from the control point. Proportional gain determines how quickly the guide vanes react to how quickly the tempera­ture is moving from WATER/BRINE CONTROL POINT. Pro- portional bands and gain values can be viewed/modified from the SER VICE3screen (accessed from the EQUIPMENT CON­FIGURATION table) and the MAINT01 screen (accessed from the CONTROL ALGORITHM STATUS table).
The Proportional Band — There are two response modes, one for temperature response above the control point, the other for response below the control point.
The first type is called PROPORTIONAL INC BAND, and it can slow or quicken vane response to chilled water/brine temperature above the WATER/BRINE DEADBAND.Itcan be adjusted from a setting of 2 to 10; the default setting is
6.5. PROPORTIONAL DEC BAND can slow or quicken vane response to chilled water temperature below deadband plus the control point. It can be adjusted on the LID from a set­ting of 2 to 10, and the default setting is 6.0. Increasing ei­ther of these settings causes the vanes to respond more slowly than at a lower setting.
and EXIT ). See Table 2 for examples of
The PROPORTIONAL ECW GAIN can be adjusted at the LID display from a setting of 1.0 to 3.0, with a default setting of
2.0. Increase this setting to increase guide vane response to a change in entering chilled water temperature.
DEMAND LIMITING — The PIC responds to the ACTIVE DEMAND LIMIT set point by limiting the opening of the guide vanes. It compares the set point to either COMPRES-
SOR MOTORLOADorCOMPRESSORMOTORLOADCUR­RENT (percentage), depending on how the control is con-
figured for the DEMAND LIMIT SOURCE which is accessed on the SERVICE1 screen. The default setting is current limiting. The ACTIVE DEMAND LIMIT may be viewed on the STATUS01 screen.
CHILLER TIMERS — The PIC maintains 2 runtime clocks, known as COMPRESSOR ONTIME and SERVICE ONTIME. COMPRESSOR ONTIME indicates the total life­time compressor run hours. This timer can register up to 500,000 hours before the clock turns back to zero.The SERV- ICE ONTIME is a resettable timer that can be used to indi­cate the hours since the last service visit or any other event. The time can be changed from the LID to whatever value is desired. This timer can register up to 32,767 hours before it rolls over to zero.
The chiller also maintains a start-to-start timer and a stop­to-start timer. These timers limit how soon the chiller can be started. See the Start-Up/Shutdown/Recycle Sequence sec­tion, page 43, for operational information.
OCCUPANCY SCHEDULE — The chiller schedule, de­scribed in the Time Schedule Operation section, page 18, determines when the chiller can run. Each schedule consists of 1 to 8 occupied/unoccupied time periods, set by the op­erator. These time periods can be enabled (or not enabled) on each day of the week and for holidays. The day begins with 0000 hours and ends with 2400 hours. The chiller is in an occupied state unless an unoccupied time period is in effect.
NOTE: To determine whether or not the chiller is in an oc­cupied state and can be started, access the STATUS01 screen and scroll to the OCCUPIED? parameter. If the value in the right column is YES, the chiller is in an occupied state and can turn on or can be started. If the value is NO, the chiller is in an unoccupied state; that is, it can shut down or cannot be started without performing an override.
The schedules can be set to follow the building schedule or to be in an occupied state 100% of the time. The sched­ules also can be bypassed by forcing the CHILLER START/ STOP parameter on the STATUS01 screen to START. For more information on forced starts, see Local Start-Up, page 43. The schedules also can be overridden to keep the chiller in an occupied state for up to 4 hours, on a one-time basis.
NOTE: A parameter value can be 9forced9 (changed by an operator) from the LID screen or from another control de­vice such as a CCN terminal. For example, if the CHILLER START/STOP parameter is set to START, the operator can go to the LID and change the value to STOP to 9force9 the chiller to stop.
Figure 14 shows a schedule for a typical office building time schedule, with a 3-hour,off-peak cool down period from midnight to 3 a.m., following a weekend shutdown. For ex­ample, holiday periods are set to be unoccupied 24 hours per day.The building operates Monday through Friday, 7:00 a.m. to 6:00 p.m., with a Saturday schedule of 6:00 a.m. to 1:00 p.m., and includes the Monday midnight to 3:00 a.m. weekend cool-down schedule.
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NOTE: This schedule is for illustration only, and is not in­tended to be a recommended schedule for chiller operation.
Depending on its operating mode, the chiller uses the fol-
lowing occupancy schedules:
• LOCAL mode — Occupancy Schedule 01(OCCPC01 on the SCHEDULE screen).
• ICE BUILD mode — Occupancy Schedule 02 (OC­CPC02 on the SCHEDULE screen).
• CCN mode — Occupancy Schedule 03-99 (OCCPC02­OCCPC99 on the SCHEDULE screen).
The CCN schedule number is specified on the CONFIG screen, which is accessed from the EQUIPMENT CON­FIGURATION table. The schedule number can be any value from 03 to 99. If this schedule number is changed on the CONFIG screen, the operator must use the ATTACHTONET­WORK DEVICE screen to upload the new number into the schedule screen. See Fig. 12.
Safety Controls — The PIC monitors all safety control
inputs, and if required, shuts down the chiller or limits the guide vanes to protect the chiller from possible damage from several conditions, including:
• high bearing temperature
• high motor winding temperature
• high discharge temperature
• low compressor oil pressure
• low gear oil pressure
• high gear oil temperature
• low cooler refrigerant temperature/pressure
• condenser high pressure or low pressure
• inadequate water/brine cooler and condenser flow
• high, low, or loss of voltage
• excessive motor acceleration time
• excessive starter transition time
• lack of motor current signal
• excessive motor amps
• excessive compressor surge
• temperature and transducer faults
Starter faults or optional protective devices within the starter can shut down the chiller. These devices depend on what options have been purchased.
Default Screen Freeze — When the chiller is in an
alarm state, the default LID display freezes; that is, it stops updating. The first line of the LID default screen displays a primary alarm message; the second line displays a second­ary alarm message. The LID default screen freezes to allow the operator to see the condition of the chiller at the time of the alarm. Knowledge of the operating state of the chiller at the time an alarm occurs is useful when troubleshooting. Cur­rent chiller information can be viewed on the STATUS screens (see Table 2, Examples 1-4). Once all existing alarms are
cleared by pressing the RESET screen returns to normal operation.
softkey, the default LID
Auxiliary Compressor Oil Pump Control — The
compressor oil pump (optional) is controlled by the PIC. If, during start-up, the main oil pump cannot raise pressure to 18 psi (124 kPa), the auxiliary oil pump (optional) is ener­gized. During compressor operation, the auxiliary oil pump is energized if the oil pressure falls below the alert threshold (18 psi [124 kPa]). Once the auxiliary compressor oil pump is running, it stays on until the compressor is turned off and is deenergized along with the main oil pump after the post­lubrication period.
Auxiliary Gear Oil Pump Control — The optional
auxiliary gear oil pump is controlled by the PIC. During start­up, if the main gear oil pump cannot raise the oil pressure at least 20 psi (139 kPa), the auxiliary gear oil pump is ener­gized. If, after 30 seconds, the required oil pressure has not been established, the PIC initiates an alarm and does not al­low the chiller to start. During operation, the auxiliary gear oil pump is energized if the oil pressure falls below the alert threshold (15 to 20 psi [103 to 139 kPa]). Once the auxiliary gear oil pump is running, it stays on until the compressor is turned off and is deenergized with the main gear oil pump after the post-lubrication period.
Shaft Seal Oil Control — For all open-drive chillers,
the shaft seal must be bathed in oil at all times, especially when the chiller is not running. This ensures that refrigerant will not leak past the seal. The PIC energizes the compressor oil pump for one minute if the oil pump has not operated during the past 12 hours.
If a compressor motor overload or ground fault occurs, check the motor for grounded or open phases before at­tempting a restart.
If the PIC control initiates a safety shutdown, the control displays a primary and secondary alarm message on the LID, energizes an alarm relay in the starter, and blinks the alarm light on the control panel. The alarm information is stored in memory and can be viewed on the LID by accessing the ALARM HISTORY table along with a troubleshooting message.
To give a more specific operating condition warning, the operator can also define alert limits on various monitored inputs. Safety contact and alert limits are defined in Table 3. Alarm and alert messages are listed in the Troubleshooting Guide section, page 83.
SHUNT TRIP — The PIC can include an optional shunt trip function that acts as a safety trip. The shunt trip is wired from an output on the SMM to the motor circuit breaker. If the PIC tries to shut down the compressor using normal shut­down procedures but is unsuccessful for 30 seconds, the shunt trip output is energized and trips off the circuit breaker. If ground fault protection has been applied to the starter, the ground fault trip also energizes the shunt trip to trip the cir­cuit breaker.
IMPORTANT: If control power is turned offfor more than 12 hours, the refrigerant charge must be pumped into the economizer/storage vessel. Because the oil heater is also turned off during this time, storing the refrig­erant prevents refrigerant from migrating into the oil.
RampLoading Control — Ramp loading control slows
down the rate at which the compressor loads up. It prevents the compressor from loading up during the short time be­tween chiller start-up and the time the chilled water loop has to be brought down to normal design conditions. Ramp load­ing helps to reduce electrical demand by slowly bringing the chilled water temperature to the control point temperature. The total power draw during this period stays almost unchanged.
The PIC bases ramp loading on either the chilled water temperature or on motor load. See the Table 2, Example 6 (CONFIG screen).
1. The temperature ramp loading rate is an operator-
configured value that limits the rate at which either the leaving chilled water or entering chilled water tempera­ture decreases (TEMP PULLDOWN DEG/MIN param­eter on the CONFIG screen). The lowest temperature ramp rate is used the first time the chiller is started (at com­missioning). The lowest temperature ramp rate is also used if chiller power has been off for 3 hours or more (even if the motor ramp load control method has been selected).
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Table 3 — Protective Safety Limits and Control Settings
MONITORED PARAMETER LIMIT APPLICABLE COMMENTS
TEMPERATURE SENSORS OUT OF RANGE
PRESSURE TRANSDUCERS OUT OF RANGE
COMPRESSOR DISCHARGE TEMPERATURE
BEARING TEMPERATURE .220 F (104.4 C) Preset, alert setting configurable EVAPORATOR REFRIGERANT
TEMPERATURE (Temp converted from Pressure Reading)
TRANSDUCER VOLTAGE ,4.5 vdc . 5.5 vdc
CONDENSER PRESSURE — SWITCH
COMPRESSOR OIL PRESSURE — SWITCH Cutout ,11 psid (76 kPad) ± 1.5 psid (10.3 kPad)
— CONTROL
LINE VOLTAGE — HIGH .110% for one minute
COMPRESSOR MOTOR LOAD (% Compressor Amps)
STARTER ACCELERATION TIME (Determined by inrush current going below 100% compressor motor load)
STARTER TRANSITION .75 seconds Reduced voltage starters only
CONDENSER FREEZE PROTECTION
IMPELLER CLEARANCE Displacement switch open Thrust movement excessive MOTOR LEAK DETECTOR (TEWAC
MOTORS ONLY) GEAR OIL TEMPERATURE
— CONTROL GEAR OIL PRESSURE
—CONTROL
— LOW ,90% for one minute or <85% for 3 seconds — SINGLE-CYCLE ,50% for one cycle
— CONTROL 215 psig (1482 kPa) Preset
–40 to 245 F (–40 to 118.3 C) Must be outside range for 2 seconds
0.08 to 0.98 Voltage Ratio
.220 F (104.4 C) Preset, alert setting configurable
,33 F (for water chilling) (0.6° C) ,Brine Refrigerant Trippoint (set point adjustable
from 0 to 40 F [–18 to 4 C] for brine chilling)
.218 ± 7 psig (1503 ± 48 kPa), reset at 120 ± 10 (827 ± 69 kPa)
Cut-in .16.5 psid (114 kPad) ± 4 psid (27.5 kPad) Cutout ,15 psid (103 kPad)
Alert ,18 psid (124 kPad)
.110% for 30 seconds Preset ,10% with compressor running Preset .10% with compressor off Preset
.45 seconds .10 seconds
Energizes condenser pump relay if condenser refrigerant tem­perature or condenser entering water temperature is below the configured condenser freeze point temperature. Deenergizes when the temperature is5F(3C)above condenser freeze point temperature.
Water from motor cooling is leaking Cut-Out > 150 F (66 C)
Alert > 130-145 (54 - 63 C) Cut-out < 12 psi (83 kPa)
Alert < 15-20 psi (103 - 139 kPa)
Must be outside range for 2 seconds. Ratio = Input Voltage ÷ Voltage Reference
Preset, configure chilled medium for water (Service1 table)
Configure chilled medium for brine (Service1 table). Adjust brine refrigerant trippoint for proper cutout
Preset (Read voltage at terminals 34 and 35 on PSIO module)
Preset
Preset, no calibration needed Preset Preset, based on transformed line voltage to
24 vac rated-input to the Starter Management Module. Also monitored at PSIO power input.
For chillers with reduced voltage mechanical and solid-state starters
For chillers with full voltage starters (Configured on Service1 table)
CONDENSER FREEZE POINT configured in Service01 table with a default setting of 34F(1C).
Water sensors are installed only on open-drive motors that use water cooling. (Totally enclosed, water-to-air cooled [TEWAC] motors)
Preset Adjustable
Preset Adjustable
FLOW SWITCHES (Field Supplied)
Operate water pumps with chiller off. Manually reduce water flow and observe switch for proper cutout. Safety shutdown occurs when cutout time exceeds 3 seconds.
CUT-OFF SETTING ADJUSTMENT SCREW
Carrier Part No. HK06ZC033
Carrier Part No. HK06ZC001
NOTE: Dimensions in parentheses are in millimeters.
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2. The motor load ramp loading rate is an operator-configured value that limits the rate at which the compressor motor current or compressor motor load increases. (LOAD PULL- DOWN %/MIN on the CONFIG screen).
To select the ramp type, highlight the SELECT RAMP TYPE parameter on the CONFIG screen and select either 0(TEMP)or1(LOAD). Motor load (1) is the default ramp loading control type.
Capacity Override (See Table4) — Capacity over-
rides can prevent some safety shutdowns caused by exceed­ing the motor amperage limit, refrigerant low temperature safety limit, motor high temperature safety limit, and con­denser high pressure limit. In all of these cases, there are 2 stages of compressor vane control.
1. The guide vanes are kept from opening further, and the
status line on the LID displays the reason for the override.
2. The guide vanes are closed until the condition decreases
below the first step set point. Then, the vanes are released to normal capacity control.
Whenever the motorcurrentdemandlimitsetpoint is reached, it activates a capacity override, again using the 2-step pro­cess. Exceeding 110% of the rated load amps for more than 30 seconds initiates a safety shutdown.
The compressor high lift (surge prevention) set point causes a capacity override as well. When the surge prevention set point is reached, the PIC normally prevents the guide vanes from opening. See the Surge Prevention Algorithm section, page 37. If the chiller is equipped with the hot gas bypass option, the PIC opens the hot gas bypass valve instead of holding the guide vanes.
HighDischarge TemperatureControl— If the dis-
charge temperature increases above 200 F (93 C), the guide vanes are proportionally opened to increase gas flow through the compressor.If the leaving chilled water temperature drops 5° F (2.8° C) below the control point temperature, chiller enters the RECYCLE mode.
OilSump TemperatureControl— The oil sump tem-
perature control is regulated by the PIC which uses the oil heater relay when the chiller is shut down.
As part of the pre-start checks executed by the controls, the PIC compares the oil sump temperature to the evapora­tor refrigerant temperature. If the difference between these 2 temperatures is 50 F (27.8 C) or less, the start-up is delayed until the oil temperature difference is 50 F (27.8 C) or more. Once this temperature is confirmed, the start-up continues.
The oil heater relay is energized whenever the chiller com­pressor is off and the oil sump temperature is less than 150 F (65.6 C) or the oil sump temperature is less than the cooler refrigerant temperature plus 70° F (39° C). The oil heater is turned off when the oil sump temperature is either
• more than 160 F (71.1 C)
• or the oil sump temperature is more than 155 F (68.3 C)
and more than the cooler refrigerant temperature plus 75° F (41.6° C).
The oil heater is always off during start-up or when the compressor is running.
When a power failure to the PSIO module has occurred for more than 3 hours (i.e., initial start-up), the compressor guide vane opening is slowed down to prevent excessive oil foaming that may result from refrigerant migration into the oil sump during the power failure. The vane opening is slowed via temperature ramp loading to a value of 2° F (1.1° C) per minute.
OVERRIDE CAPACITY
CONTROL
HIGH CONDENSER
PRESSURE
LOW REFRIGERANT
TEMPERATURE
(Refrigerant Override
Delta Temperature)
HIGH COMPRESSOR
LIFT
(Surge Prevention)
MANUAL
GUIDE VANE
TARGET
MOTOR LOAD —
ACTIVE
DEMAND LIMIT
LEGEND
HGBP — High Gas Bypass P1 Minimum Pressure Load P2 Maximum Pressure Load T1 Minimum Temperature Load T2 Maximum Temperature Load
View/Modify
on LID Screen
Equipment
Equipment
Equipment
Algorithm
Table 4 — Capacity Overrides
FIRST STAGE SETPOINT
Default Value Configurable Range Value Value
Service1
Service1
Service1
Control Maint01
Status01 100% 40 to 100%
125 psig
(862 kPa)
,3° F (1.6° C)
(Above Trippoint)
Min: T1 — 1.5° F
(0.8° C) P1 — 50 psid (345 kPad)
Max: T2 — 10° F
(5.6° C) P2 — 85 psid (586 kPad)
Automatic 0 to 100% None
90 to 200 psig
(620 to 1379 kPa)
2° to 5° F
(1° to 3° C)
0.5° to 15° F
(0.3° to 8.3° C)
30 to 170 psid
(207 to1172 kPad)
0.5° to 15° F
(0.3° to 8.3° C)
30 to 170 psid
(207 to 1172 kPad)
SECOND STAGE
SETPOINT
.Override
Set Point
+ 4 psid (28 kPad)
<Trippoint + Override
DT –1° F (0.56° C)
None
>5% of
Set Point
OVERRIDE
TERMINATION
,Override
Set Point
.Trippoint + Override
DT +2° F
(1.2° C)
Within
Lift Limits
Plus Surge/
HGBP
Deadband
Setting
Release of
Manual Control
2% Lower
Than
Set Point
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Oil Cooler — The oil for the external gear and the com-
pressor must be cooled while the compressor is running. The compressor oil cooler is a water-cooled, helical, tube-in­shell type heat exchanger. A plug valve is manually set to maintain proper temperatures. Set the valve to maintain a 145 F (63 C) oil sump temperature while the compressor is running.
The gear oil cooler is a water-cooled, helical tube-in-shell type heat exchanger. A plug valve is manually set to main­tain proper temperatures. Set the valve to maintain the oil temperature leaving the cooler at 130 F (54 C) while the com­pressor is running.
RemoteStart/Stop Controls — A remote device, such
as a time clock with a set of contacts, may be used to start and stop the chiller. However, the device should not be pro­grammed to start and stop the chiller more than 2 or 3 times every 12 hours. If more than 8 starts in 12 hours occur, the Excessive Starts alarm is displayed, and the chiller is pre­vented from starting. The operator must reset the alarm at the LID in order to override the starts counter and start the chiller. If the automatic restart after a power failure (AUTO REST ARTOPTION ) is not activated (disabled) when a power failure occurs and the remote contact is closed, the PIC con­trol activates an alarm because of the loss of voltage.
The contacts for remote starting are wired into the starter at terminal strip TB5, terminals 8A and 8B. See the certified drawings for further details on contact ratings. The contacts must be dry (no power).
Spare Safety Inputs — Normally closed (NC) digital
inputs for additional field-supplied safeties may be wired to the spare protective limits input channel in place of the factory­installed jumper. (Wire multiple inputs in series.) Opening any contact results in a safety shutdown and LID display. Refer to the certified drawings for safety contact ratings.
Analog temperature sensors may also be added to the op­tions modules, if installed. These may be programmed to ac­tivate an alert on the CCN network, but not shut down the chiller.
SpareAlarmContacts — Twospare sets of alarm con-
tacts are provided in the starter. The contact ratings are pro­vided in the certified drawings. The contacts are located on terminal strip TB6, terminals 5A and 5B, and terminals 5C and 5D.
Condenser Pump Control — The chiller monitors
the condenser pressure (CONDENSER PRESSURE param­eter on the STATUS01 screen) and may turn on the con­denser pump if the pressure becomes too high whenever the compressor is shut down. The condenser pressure override (COND PRESSURE OVERRIDE parameter on the SERVICE1 screen) is the value that determines this pressure point. Its default value is 125 psi (862 kPa). If the condenser pressure is greater than or equal to the condenser pressure override, and the entering condenser water temperature (EN- TERING CONDENSER WATER parameter on the STATUS01 screen) is less than 115 F (46 C), then the con­denser pump energizes to try to decrease the pressure. The pump turns offwhen the condenser pressure is 5psi (34 kPa) less than the pressure override, or when the condenser re­frigerant temperature (CONDENSER REFRIG TEMP on the STATUS01 screen) is within 3° F (2° C) of the entering con­denser water temperature.
Condenser Freeze Prevention — This control al-
gorithm helps prevent condenser tube freeze-up by energiz­ing the condenser pump relay. If the pump is controlled by the PIC, starting the pump helps prevent the water in the condenser from freezing. Condenser freeze prevention can occur whenever the chiller is not running except when it is either actively in pumpdown or in pumpdown lockout with the freeze prevention disabled.
When the condenser refrigerant temperature is less than or equal to the condenser freeze point (CONDENSER FREEZE POINT on the SERVICE1 screen), or the entering condenser water temperature is less than or equal to the condenser freeze point, then the condenser water pump (CONDENSER WA- TER PUMP on the STATUS02 screen) is energized until the condenser refrigerant temperature is greater than the con­denser freeze point plus 5° F (2.7° C). If the chiller is in PUMPDOWN mode and the pump is energized, the PIC ac­tivates an alarm. If the chiller is not in PUMPDOWN mode and the pump is energized, the PIC activates an alert. If the chiller is in RECYCLE shutdown mode, the mode transi­tions to SHUTDOWN (non-recycle shutdown).
Tower-Fan Relay — This control can be used to assist
the condenser water temperature control system (field sup­plied). Low condenser water temperature can cause the chiller to shut down on low refrigerant temperature. The tower fan relay, located in the starter, is controlled by the PIC to en­ergize and deenergize as the pressure differential between cooler and condenser vessels changes. This function pre­vents low condenser water temperature and maximizes chiller efficiency. The tower-fan relay can only accomplish this if the relay has been added to the cooling tower temperature controller.The tower-fan relay (TOWER FAN RELAY on the STATUS02 screen) is turned on whenever the condenser wa­ter pump is running, flow is verified, and the difference be­tween cooler and condenser pressure is more than 30 psid (207 kPad) or entering condenser water temperature is greater than 85 F (29 C). The tower-fan relay is deenergized when­ever the condenser pump is off, flow is lost, the evaporator refrigerant temperature is less than the override temperature, or the differential pressure is less than 28 psid (193 kPad) and entering condensing water is less than 80 F (27 C).
IMPORTANT:A field-supplied water temperature con­trol system for condenser water should be installed. The system should maintain the leaving condenser wa­ter temperature at 20° F (11° C) above the leaving chilled water temperature.
The tower-fan relay control is not a substitute for a con­denser water temperature control. When used with a wa­ter temperature control system, the tower-fan relay con­trol can be used to help prevent low condenser water temperatures and associated problems.
Auto. Restart After Power Failure — This option,
which may be viewed or modified on the CONFIG screen (the AUTO RESTART OPTION parameter), can be enabled or disabled. If this option is enabled, the chiller starts up au­tomatically after a single cycle dropout; low, high, or no volt­age; and the power is within ±10% of normal. The 15-minute start-to-start timer and the stop-to-start timer are ignored during this type of start-up.
When power is restored after a power failure, and if the compressor had been running, the oil pump is energized for one minute before the evaporator pump is energized. The Auto. Restart function then continues like a normal start-up.
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Water/Brine Reset — Three types of chilled water/
brine reset are available, Reset Type 1, Reset Type 2, and Reset Type 3. They can be viewed or modified on the CON­FIG screen (accessed from the EQUIPMENT CONFIGU­RATION table). See Table 2, Example 6.
The LID default screen status message indicates when a reset is active. The WATER/BRINE CONTROL POINT tem- perature on the STATUS01 table indicates the chiller’s cur­rent reset temperature.
To configure a reset type, input all configuration informa­tion for that reset type on the CONFIG screen. Then activate the reset type by entering the reset type number in the SELECT/ ENABLE RESET TYPE input line.
RESET TYPE 1 (Requires an optional 8-input module) — Reset Type 1 is an automatic chilled water temperature reset based ona4to20mAinput signal. The value for Rest Type 1 is user configurable (DEGREES RESET AT 20 mA). It is a temperature that corresponds to a 20 mA signal. (4 mA corresponds to 0° F [0° C]; 20 mA corresponds to the tem­perature entered by the operator.)
This reset type permits up to ±30° F (±16° C) of auto­matic reset to the chilled water/brine temperature set point, based on the input froma4to20mAsignal. The signal is hardwired into the No. 1 eight-input module.
If the 4 to 20 mA signal is externally powered from the 8-input module, the signal is wired to terminals J1-5(+) and J1-6(–). If the signal is powered internally by the 8-input module (for example, when using variable resistance), the signal is wired to J1-7(+) and J1-6(–). The PIC must be configured on the SERVICE2 screen to ensure that the appropriate power source is identified. See Table 2, Example 9, 20 mA POWER CONFIGURATION.
RESET TYPE 2 (Requires an optional 8-input module) — Reset Type 2 is an automatic chilled water temperature reset based on a remote temperature sensor input.
This reset type permits ±30° F (±16° C) of automatic re­set to the set point based on a temperature sensor wired to the No. 1 eight-input module (see wiring diagrams or cer­tified drawings). The temperature sensor must be wired to terminal J1-19 and J1-20.
Configure Reset Type 2 on the CONFIG screen (Table 2, Example 6). Enter the temperature of the remote sensor at the point where no temperature reset will occur (REMOTE TEMP [NO RESET]). Next, enter the temperature at which the full amount of reset will occur (REMOTE TEMP [FULL RESET]). Then, enter the maximum amount of reset re­quired to operate the chiller (DEGREES RESET). Reset Type 2 can now be activated.
RESET TYPE 3 — Reset Type 3 is an automatic chilled wa­ter temperature reset based on cooler temperature differ­ence. This reset adds ±30° F (±16° C) based on the tempera­ture difference between entering and leaving chilled water. Reset Type 3 is the only reset available without the need for a No. 1 eight-input module. No wiring is required for Reset Type 3, because it already uses the cooler water sensors.
Configure Reset Type 3 on the CONFIG screen (Table 2, Example 6). Enter the chilled water temperature difference (the difference between entering and leaving chilled water) at which no temperature reset occurs (CHW DELTA T [NO RESET]). This chilled water temperature difference is usu­ally the full design load temperature difference. Enter the difference in chilled water temperature at which the full amount of reset occurs (CHW DELTA T [FULL RESET]). Next, enter the amount of reset (DEGREES RESET). Reset Type 3 can now be activated.
Demand Limit Control Option (Requires Optional 8-Input Module) —
be externally controlled witha4to20mAsignal from an Energy Management System (EMS). The option (20 mA DE- MAND LIMIT OPTION) is enabled or disabled on the CON­FIG screen (Table 2, Example 6). When enabled, the control is set for 100% demand with 4 mA and an operator config­ured minimum demand set point at 20 mA (DEMAND LIMIT AT 20 mA).
The EMS demand reset input is hardwired into the No. 1 8-input module. The signal may be internally powered by the module or externally powered. If the signal is externally powered, the signal is wired to terminals J1-1(+) and J1-2(–). If the signal is internally powered, the signal is wired to terminals J1-3(+) and J1-2(–). When enabled, the control is set for 100% demand with 4 mA and an operator config­ured minimum demand set point at 20 mA (DEMAND LIMIT
AT 20 mA).
The demand limit may
Surge Prevention Algorithm — Surge occurs when
lift conditions become so high that the gas flow across the impeller reverses. This condition can eventually cause chiller damage. Lift is defined as the difference between the pres­sure at the impeller eye and the impeller discharge. The maxi­mum lift that a particular impeller wheel can produce varies with the gas flow across the impeller and the size of the wheel.
The surge prevention algorithm is operator configurable and can determine if lift conditions are too high for the com­pressor. If they are, the PIC takes corrective action. The al­gorithm also notifies the operator, via the LID, that chiller operating conditions are marginal.
The surge prevention algorithm first determines if correc­tive action is necessary. This is done by checking 2 sets of operator configured data points: the minimum load points (MIN. LOAD POINTS [T1/P1]) and the maximum load points (FULL LOAD POINTS [T2/P2]). See the SERVICE1 screen or Table 2, Example 8. These points have default set­tings. Information on how to modifiy the default minimum and maximum load points can be found in the Input Service Configurations section on page 54.
Figures 18 and 19 graphically display these settings and the algorithm function. The 2 sets of load points (default set­tings) describe a line that the algorithm uses to determine the maximum lift of the compressor. Whenever the actual differential pressure between the cooler and condenser and the temperature difference between the entering and leaving chilled water are above the line on the graph (as defined by the minimum and maximum load points) the algorithm goes into a corrective action mode. If the actual values are below the line, the algorithm takes no action.
Corrective action can be taken by making one of 2 choices. If the optional hot gas bypass line is present, and the op­erator selects the hot gas bypass option on the SERVICE1 screen (selects 1 for the SURGE LIMIT/HGBP OPTION), then the hot gas bypass valve can be energized. If the hot gas bypass option is not present, then the SURGE LIMIT/HGBP OPTION is on the default setting (0), and the guide vanes are held. (Also see Table 4, Capacity Overrides.) Both cor­rective actions reduce the lift experienced by the compressor and help to prevent a surge condition.
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DP = (Condenser psi) − (Cooler psi) DT = (ECW) − (LCW)
ECW Entering Chilled Water HGBP — Hot Gas Bypass LCW Leaving Chilled Water
LEGEND
Fig. 18 — 17EX Hot Gas Bypass/Surge
Prevention With Default Settings (English)
parameter, Table 2, Example 13) can be monitored on the MAINT03 screen. The SURGE TIME PERIOD parameter is displayed and configured on the SERVICE1 screen. See Table 2, Example 8. It has a default of 2 minutes.
Lead/Lag Control — Lead/lag is a control system pro-
cess that automatically starts and stops a lag or second chiller in a 2-chiller system. Refer to Fig. 15 and 16 for menu, table, and screen selection information. On chillers that have PSIO software with lead/lag capability, it is possible to use the PIC controls to perform the lead/lag function on 2 chillers.A third chiller can be added to the lead/lag system as a standby chiller to start up if the lead or lag chiller in the system has shut down during an alarm condition and additional cooling is required.
NOTE: Lead/lag parameters can be viewed and modified on the LEAD/LAG CONFIGURATION screen, accessed from the EQUIPMENT CONFIGURATION table. See Table 2, Example 7. Lead/lag status during chiller operation is viewed on the MAINT04 screen, accessed from the CONTROL ALGORITHM STATUS table. See Table 2, Example 14.
Lead/Lag System Requirements:
• all chillers must have PSIO software capable of perform­ing the lead/lag function
• water pumps MUST be energized from the PIC controls
• water flows should be constant
• CCN Time Schedules for all chillers must be identical
Operation Features:
• 2 chiller lead/lag
• addition of a third chiller for backup
• manual rotation of lead chiller
• load balancing if configured
• staggered restart of the chillers after a power failure
• chillers may be piped in parallel or in series chilled water flow
DP = (Condenser kPa) − (Cooler kPa) DT = (ECW) − (LCW)
ECW Entering Chilled Water HGBP — Hot Gas Bypass LCW Leaving Chilled Water
LEGEND
Fig. 19 — 17EX Hot Gas Bypass/Surge Prevention
With Default Settings (SI)
Surge Protection — Compressor surge can be de-
tected by the PIC based on operator configured settings. Surge causes amperage fluctuations of the compressor motor. The PIC monitors these amperage swings, and if the swing is greater than the configured setting (SURGE DELTA PERCENT AMPS) in one second, then one surge event has occurred. The setting is displayed and configured on the SERVICE1 screen. Its default setting is 25% amps.
Asurge protection chiller shutdown occurs when the surge protection counter reaches 12 within an operator specified time period, known as the surge time period. The surge protection count (SURGE PROTECTION COUNTS
COMMON POINT SENSOR INSTALLATION — Lead/ lag operation does not require a common chilled water point sensor. Common point sensors can be added to the 8-input option module, if desired. Refer to the certified drawings for termination of sensor leads.
NOTE: If the common point sensor option is chosen on a chilled water system, each chiller should have its own 8-input option module and common point sensor installed. A chiller uses its own common point sensor forcontrol when that chiller is designated as the lead chiller. The PIC cannot read the value of common point sensors installed on other chillers in the chilled water system.
When installing chillers in series, use a common point sen­sor.If a common point sensor is not used, the leaving chilled water sensor of the upstream chiller must be moved into the leaving chilled water pipe of the downstream chiller.
If return chilled water control is required on chillers piped in series, the common point return chilled water sensor should be installed. If this sensor is not installed, the return chilled water sensor of the downstream chiller must be relocated to the return chilled water pipe of the upstream chiller.
To properly control the common supply point temperature sensor when chillers are piped in parallel, the water flow through the shutdown chiller(s) must be isolated so there is no water bypass around the operating chiller. The common point sen­sor option must not be used if water bypass around the op­erating chiller is occurring.
CHILLER COMMUNICATION WIRING — Refer to the chiller Installation Instructions and the Carrier Comfort Net­work Interface section on page 53 of this manual for infor­mation on chiller communication wiring.
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LEAD/LAG OPERATION — The PIC control has the ca­pability to operate 2 chillers in the lead/lag mode. It also has the additional capability to start a designated standby chiller when either the lead or lag chiller is not operating and capacity requirements are not being met. The lead/lag option operates in CCN mode only. If any other chiller con­figured for lead/lag is set to the LOCAL or OFF modes, it will be unavailable for lead/lag operation.
NOTE: Lead/lag configuration is viewed and edited on the LEAD/LAG screen, accessed from the EQUIPMENT CON­FIGURATION table of the SERVICE menu. See Table 2, Example 7. Lead/lag status during chiller operation is viewed on the MAINT04 screen, accessed from the CONTROL AL­GORITHM STATUS table. See Table 2, Example 14.
Lead/Lag Chiller Configuration and Operation — A chiller is designated the lead chiller when the LEAD/LAG SELECT parameter for that chiller is set to 1 on the LEAD/ LAG CONFIGURATION screen.Achiller is designated the lag chiller when the LEAD/LAD SELECT parameter for that chiller is set to 2. A chiller is designated the standby chiller when the LEAD/LAG SELECT parameter for that chiller is set to 3. Setting the LEAD/LAG SELECT parameter to 0 dis­ables the lead/lag function in that chiller.
To configure the LAG ADDRESS parameter on the LEAD/ LAG CONFIGURATION screen, always use the address of the other chiller on the system. Using this address makes it easier to rotate the lead and lag chillers.
If improper address assignments are entered for the LAG ADDRESS and STANDBY ADDRESS parameters, the lead/lag is disabled and an alert (!) message displays on the LID. For example, if the lag chiller’s address matches the lead chiller’s address, the lead/lag function is disabled and an alert (!) message displays. The lead/lag maintenance screen (MAINT04) displays the message INVALID CONFIG in the LEAD/LAG CONFIGURATIONand CURRENTMODEfields.
The lead chiller responds to normal start/stop controls such as occupancy schedule, forced start/stop, and remote start contact inputs. After completing start-up and ramp loading, the PIC evaluates the need for additional capacity. If addi­tional capacity is needed, the PIC initiates the start-up of the chiller configured at the lag address. If the lag chiller is faulted (in alarm) or is in the OFF or LOCAL modes, then the chiller at the standby address (if configured) is requested to start. After the second chiller is started and is running, the lead chiller monitors conditions and evaluates whether the ca­pacity has been reduced enough for the lead chiller to sus­tain the system alone. If the capacity is reduced enough for the lead chiller to sustain the control point temperatures alone, then the operating lag chiller is stopped.
If the lead chiller is stopped in CCN mode for any reason other than an alarm (*) condition, then the lag and standby chillers are stopped. If the configured lead chiller stops for an alarm condition, then the configured lag chiller takes the lead chiller’s place as the lead chiller and the standby chiller serves as the lag chiller.
If the configured lead chiller does not complete the start-up before the PRESTART FAULT TIMER (a user configured pa- rameter on the LEAD/LAG screen) elapses, then the lag chiller is started and the lead chiller shuts down. The lead chiller then monitors the request to start from the acting lead chiller. The pre-start fault timer is initiated at the time of a start re­quest. This timer’s function is to provide a time-out if there is a pre-start alert condition that prevents the chiller from starting in a timely manner.
If the lag chiller does not achieve start-up before the pre-start fault time elapses, then the lag chiller is stopped and the standby chiller is requested to start, if configured and ready.
Standby Chiller Configuration and Operation — The con­figured standby chiller is identified as such by having its LEAD/ LAG SELECT parameter assigned a value of 3. The standby chiller can only operate as a replacement for the lag chiller if one of the other two chillers is in an alarm (*) condition (as indicated on the LID panel). If both lead and lag chillers are in an alarm (*) condition, the standby chiller defaults to operate in CCN mode based on its configured occupancy sched­ule and remote contacts input.
Lag Chiller Start-Up Requirements — Before the lag chiller can be started, the following conditions must be met.
1. Lead chiller ramp loading must be completed.
2. Lead chiller’s chilled water temperature must be greater than the WATER/BRINECONTROL POINT (STA­TUS01 screen) plus half the WATER/BRINE DEAD- BAND (SERVICE1 screen).
NOTE: The chilled water temperature sensor may be the leaving chilled water sensor, the return water sensor, the common supply water sensor, or the common return wa­ter sensor, depending on which options are configured and enabled.
3. Lead chiller ACTIVE DEMAND LIMIT (STATUS01 screen) value must be greater than 95% of full load amps.
4. Lead chiller temperature pulldown rate (TEMP PULL- DOWN DEG/MIN on the CONFIG screen) of the chilled water temperature is less than 0.5° F (0.27° C) per minute.
5. The lag chiller status indicates it is in CCN mode and is not faulted. If the current lag chiller is in an alarm con­dition, then the standby chiller becomes the active lag chiller, if it is configured and available.
6. The configured time for the LAG START TIMER param­eter has elapsed. The lag start timer starts when the lead chiller ramp loading is completed. The LAG STARTTIMER parameter is on the LEAD/LAG screen, which is ac­cessed from the EQUIPMENT CONFIGURATION table. See Table 2, Example 7.
When all the above requirements have been met, the lag chiller is forced to a STARTUPmode. The PIC control then monitors the lag chiller for a successful start. If the lag chiller fails to start, the standby chiller, if configured, is started.
Lag Chiller Shutdown Requirements — The following con­ditions must be met in order for the lag chiller to be stopped.
1. Lead chiller COMPRESSOR MOTOR LOAD (STA-
TUS01 screen) value is less than the lead chiller percent capacity plus 15%. See STATUS01 screen or Table 2, Example 1.
NOTE: Lead chiller percent capacity = 100 – LAG PER-
CENT CAPACITY.
The LAG PERCENT CAPACITY value is configured on the LEAD/LAG CONFIGURATION screen.
2. The lead chiller chilled water temperature is less than
the WATER/BRINE CONTROL POINT plus 1/2 of the
W ATER/BRINE DEADBAND. The WATER/BRINE DEAD­BAND parameter is on the SERVICE1 screen. See
Table 2, Example 8.
3. The configured lag stop time (LAG STOP TIMER param-
eter on the LEAD/LAG CONFIGURATION screen) has elapsed. The lag start time starts when the LEAVING
CHILLED WATER temperature is less than the WATER/ BRINE CONTROL POINT plus 1/2 of the WATER/ BRINE DEADBAND, and the lead chiller COMPRESSOR MOTOR LOAD is less than the lead chiller percent ca-
pacity plus 15%. The lag stop timer is ignored if the chilled water temperature reaches 3° F (1.67° C) below the WA TER/
BRINE CONTROL POINT and the lead chiller COM­PRESSOR MOTOR LOAD value is less than the lead chiller
percent capacity plus 15%.
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FAULTED CHILLER OPERATION — If the lead chiller shuts down because of an alarm (*) condition, it stops com­municating with the lag and standby chillers. After 30 sec­onds, the lag chiller becomes the acting lead chiller and starts and stops the standby chiller, if necessary.
If the lag chiller faults when the lead chiller is also faulted, the standby chiller reverts to a stand-alone CCN mode of operation.
If the lead chiller is in an alarm (*) condition (indicated on the LID ), the RESET alarm, and the lead chiller is placed in CCN mode, the lead
chiller communicates and monitors the run status of the lag and standby chillers. If both the lag and standby chillers are running, the lead chiller does not attempt to start and does not assume the role of lead chiller until either the lag or standby chiller shuts down. If only one chiller is running, the lead chiller waits for a start request from the operating chiller. When the configured lead chiller starts, it assumes its role of lead chiller.
LOAD BALANCING — When the LOAD BALANCE OP- TION (LEAD/LAG screen) is enabled, the lead chiller sets the ACTIVE DEMAND LIMIT in the lag chiller to the lead chiller’s COMPRESSOR MOTOR LOAD value. This value has limits of 40% to 100%. When setting the lag chiller AC- TIVE DEMAND LIMIT ,the WATER/BRINECONTROL POINT is modified to a value of 3° F (1.67° C) less than the lead chiller’sW ATER/BRINECONTROLPOINT value. If the LOAD BALANCE OPTION is disabled, the ACTIVE DEMAND LIMIT and the WATER/BRINE CONTROL POINT are forced to the same value as the lead chiller.
AUTO. RESTART AFTER POWER FAILURE— When an auto. restart condition occurs, each chiller may have a delay added to the start-up sequence, depending on its lead/lag con­figuration. The lead chiller does not have a delay. The lag chiller has a 45-second delay. The standby chiller has a 90-second delay. The delay time is added after the chiller water flow verification. The PIC controls ensure that the guide vanes are closed.After the guide vane position is confirmed, the delay for lag and standby chillers occurs before ener­gizing the oil pump. The normal start-up sequence then con­tinues. The auto. restart delay sequence occurs whether the chiller is in CCN or LOCAL mode and is intended to stag­ger the compressor motor start-up times. This helps reduce the in-rush of demand on the building power system.
softkey is pressed to clear the
Ice Build Control — Ice build control automatically sets
the chilled WATER/BRINE CONTROL POINT of the chiller from a normal operation set point temperature to a tempera­ture that allows an ice building operation for thermal storage.
NOTE: For ice build control to operate properly, the PIC controls must be placed in CCN mode.
The PIC can be configured for ice build operation by chang-
ing entries on the:
• CONFIG screen, accessed from the SERVICE menu
• OCCPC02S screen (ice build time schedule), accessed from
the SCHEDULE menu
• SETPOINT screen, accessed from the SETPOINT menu. Figures 15 and 16 show how to access each screen.
The ice build time schedule defines the periods during which the ice build option can be activated, if the ice build option is enabled. If the ice build time schedule overlaps other sched­ules, the ice build time schedule takes priority. During an ice
build period, the WATER/BRINE CONTROL POINT is set to the ICE BUILD SETPOINT (SETPOINT screen) for tem­perature control.
The ICE BUILD RECYCLE OPTION and ICE BUILD TERMINATION parameters are on the CONFIG screen. The ice build recycle option can be enabled or disabled from this screen; the ice build termination value can be set to 0, 1, or 2, depending on the factor that determines termination (tem­perature, contacts, or both). Ice build termination can occur when:
• the ENTERING CHILLED WATERtemperature is less than
the ICE BUILD SETPOINT
• the REMOTE CONTACTS INPUT (STATUS01 screen) is
opened based on input from an ice level indicator
• the end of the ice build time schedule has been reached. ICE BUILD INITIATION — The ice build option is acti-
vated via the ice build time schedule on the OCCPC02S screen. If the current time is set asan ice build time on the OCCPC02S screen and the ICE BUILD OPTION on the CONFIG screen is enabled, then the ice build option is active and the fol­lowing events automatically take place (unless overridden by a higher authority CCN device):
1. CHILLER START/STOP is forced to START.
2. The WATER/BRINE CONTROL POINT is forced to the
ICE BUILD SETPOINT.
3. Any force (Auto) on the ACTIVE DEMAND LIMIT is
removed.
NOTE: Items 1-3 (shown above) do not occur if the chiller is configured and operating as a lag or standby chiller for lead/lag operation and is actively controlled by a lead chiller. The lead chiller communicates the ICE BUILD SETPOINT, desired CHILLER START/STOP state, and ACTIVE DE- MAND LIMIT to the lag or standby chiller as required for ice build, if configured to do so.
START-UP/RECYCLE OPERATION — If the chiller is not running when ice build activates, then the PIC checks the following parameters, based on the ICE BUILD TERMINATION value, to avoid starting the compressor unnecessarily:
• if the ICE BUILD TERMINATION parameter is set to 0
(temperature only), and the ENTERING CHILLED WA-
TER temperature is less than or equal to the ICE BUILD SETPOINT;
• if the ICE BUILD TERMINATION parameter is set to 1
(contacts only) and the remote contacts are open;
• if the ICE BUILD TERMINATION parameter is set to 3
(both temperature and contacts), the ENTERING CHILLED
W ATER temperature is less than or equal to the ICE BUILD SETPOINT, and the remote contacts are open.
The ICE BUILD RECYCLE OPTION determines whether or not the PIC goes into aRECYCLE mode. If the ICE BUILD RECYCLE OPTION is set to DSABLE (disable) when the ice build terminates, the PIC reverts to normal temperature control duty. If the ICE BUILD RECYCLE OPTION is set to ENABLE, when ice build terminates, the PIC goes into an ice build recycle mode and the chilled water pump relay re­mains energized to keep the chilled water flowing. If the EN- TERING CHILLED W A TER(brine) temperature increases above the ICE BUILD SETPOINT plus the RECYCLE RESTART DELTATvalue, the compressor restarts and controls the chilled water/brine temperature to the ICE BUILD SETPOINT.
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TEMPERATURE CONTROL DURING ICE BUILD —During ice build, the capacity control algorithm uses the WATER/BRINE CONTROL POINT minus 5 F (2.7 C) to con­trol the LEAVING CHILLED WATERtemperature. The ECW
CONTROL OPTION (see CONFIG screen), the 20 mA DEMAND LIMIT, and any temperature reset option are ig-
nored during ice build. TERMINATION OF ICE BUILD — Ice build termination
occurs under the following conditions:
1. Ice Build Time Schedule — The ice build function ter­minates when the current time is not designated as an ice build time period.
2. Entering Chilled Water Temperature — Compressor op­eration terminates based on temperature if the ICE BUILD TERMINATION parameter on the CONFIG screen is set to 0 (temperature only) and the ENTERING CHILLED
WATER temperature is less than the ICE BUILD SET­POINT.IftheICE BUILD RECYCLE OPTION is set to
ENABLE, a recycle shutdown occurs and recycle start­up is based on a LEAVING CHILLED WATER tempera- ture greater than the WATER/BRINE CONTROL POINT plus RECYCLE RESTART DELTA T (see SERVICE1 screen).
3. Remote Contacts/Ice Level Input — Compressor opera­tion terminates when the ICE BUILD TERMINATION pa­rameter is set to 1 (contacts only) and the remote contacts are open. In this case, the contacts are used for ice level termination control. The remote contacts can still be opened and closed to start and stop the chiller if the current time is not a time designated as an ice build period. If the cur­rent time is designated as an ice build period, the contacts are used to stop the ice build function.
4. Entering Chilled Water Temperature and Remote Con­tacts — Compressor operation terminates when the ICE BUILD TERMINATION parameter is set to 2 (both tem­perature and contacts) and the previously described con­ditions for ENTERING CHILLED WATERtemperature and remote contacts have occurred.
NOTE: Overriding the CHILLER START/STOP, WATER/ BRINE CONTROL POINT, and ACTIVE DEMAND LIMIT values by CCN devices (with a priority less than 4) during the ice build period is not possible. However, overriding can be accomplished with CCN during two-chiller lead/lag operation.
RETURN TO NON-ICE BUILD OPERATIONS — When the ice build function terminates, the chiller returns to nor­mal temperature control and start/stop schedule operation. If the CHILLER START/STOP or WATER/BRINE CONTROL POINT has been forced (with a priority less than 4), before the start of ice build operation, then CHILLER START/STOP and WATER/BRINE CONTROL POINT forces are removed; that is, under these circumstances, the ice build operation takes precedence over the force.
Attach to Network Device Control — One of the
selections on the SERVICE menu is ATTACH TO NET­WORK DEVICE. See Fig. 12. This table serves the follow­ing purposes:
• uploads the occupancy schedule number (OCCPC03S), if
changed, as defined in the CONFIG screen (SCHEDULE NUMBER).
• attaches the LID to any CCN device, if the chiller has been
connected to a CCN network. This may include other PIC controlled chillers.
• uploads changes from a new PSIO or LID module or up-
graded software.
Figure 20 shows the ATTACH TO NETWORK DEVICE table as it appears on the LID. The LOCAL entry is always the PSIO module address of the chiller the LID is mounted on. Whenever the controller identification of the PSIO is changed, this change is reflected on the bus and address for the LOCAL DEVICE of the ATTACH TO DEVICE screen automatically.
NAME DESCRIPTOR
Fig. 20 — Example of Attach to Network
Device Screen
Whenever the ATTACH TO NETWORK DEVICE table is accessed, no information can be read from the LID on any device until you attach one of the devices listed on the dis­play. As soon as this screen appears, the LID erases infor­mation about the module to which it was attached to make room for information on another device. Therefore, a CCN module must be attached when this screen is entered.
To attach to a device listed on this screen, highlight it us­ing the SELECT
softkey. Then press the ATTACH soft-
key.The message, UPLOADINGTABLES, PLEASE WAIT , flashes. The LID then uploads the highlighted device or mod­ule. If the device address cannot be found, the message, COM­MUNICATION FAILURE, appears. The LID then reverts to the ATTACH TO NETWORK DEVICE screen. Try another device or check the address of the device that did not attach. The upload process time for each CCN module is different. In general, the uploading process takes 3 to 5 minutes.
NOTE: Before leaving the ATTACH TO NETWORK DE­VICE screen, select the LOCAL device. Otherwise, the LID will be unable to display information on the local chiller.
ATTACHINGTO OTHER CCN MODULES — If the chiller PSIO has been connected to a CCN network or other PIC controlled chillers through CCN wiring, the LID can be used to view or change parameters on the other controllers. Other PIC chillers can be viewed and set points changed (if the other unit is in CCN control) if desired from this particular LID module.
To view the other devices, access the ATTACH TO NETWORK DEVICE table. Move the highlight bar to any
device number. Press the SELECT
softkey to change to the bus number and address of the module to be viewed. Press the ENTER
softkey. Press the EXIT softkey to return to
the ATTACH TO NETWORK DEVICE table. If the device number is not valid, the message, COMMUNICATION FAIL­URE, displays. Enter a new address number or check the wiring. If the device is communicating properly, the mes­sage, UPLOAD IN PROGRESS, displays and the new de­vice can now be viewed.
Whenever there is a question regarding which CCN de­vice the LID is currently showing, check the device name descriptor on the upper left hand corner of the LID screen. See Fig. 20.When the CCN device has been viewed, use the ATTACH TO NETWORK DEVICE table to attach to the PSIO that is on the chiller. From the ATTACH TO NET­WORK DEVICE table , highlight LOCAL, and press the
SELECT
softkey.Then, press the ATTACH softkey to up-
load the LOCAL device. The PSIO will upload.
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NOTE: The LID does not automatically re-attach to the PSIO module on the chiller. Access the ATTACH TO NETWORK DEVICE table, scroll to LOCAL, and press the
ATTACH
softkey to upload the local device. The software
for the local chiller will now be uploaded.
Service Operation — Figure 16 shows an overview of
the service menu. TO ACCESS THE SERVICE SCREENS
1. On the MENU screen, press the SERVICE softkeys now correspond to the numerals 1, 2, 3, and 4.
NOTE: The factory-set password is1-1-1-1.Seethe Input Service Configurations section, page 54, for informa­tion on how to change a password.
2. Press the four digits of your password, one at a time. An asterisk (*) appears as you enter each digit.
If the password is incorrect, an error message is dis­played. If this occurs, return to Step 1 and try to access the SERVICE tables again. If the password is correct, the
softkey labels change to NEXT
SELECT
, and EXIT , and the LID screen displays the
following SERVICE tables:
• Alarm History
• Control Test
• Control Algorithm Status
• Equipment Configuration
• Equipment Service
• Time and Date
• Attach to Network Device
• Log Out of Device
• Controller Identification
• LID Configuration
See Fig. 16 for additional screens and tables available form the SERVICE tables listed above. Use the EXIT return to the MENU screen.
TO LOG OFF — Access the LOG OUT OF DEVICE table from the SERVICEmenu. The LID exits the SERVICEmenu. T ore-enter the SERVICE menu, you must re-enter your pass­word as described above.
NOTE: To prevent unauthorized persons from accessing the LID service screens, the LID automatically signs off and password-protects itself if a key has not been pressed for 15 minutes. The sequence is as follows. Fifteen minutes af­ter the last key is pressed, the default screen displays, the LID screen light goes out (analogous to a screen saver), and the LID logs out of the password-protected SERVICE menu. Other screens and menus, such as the STATUS screen can be accessed without the password by pressing the appropri­ate softkeys.
HOLIDAY SCHEDULING (Fig. 21) — The time schedules may be configured for special operation during holiday pe­riods. When modifying a time period, an ‘‘H’’ at the end of the days of the week field signifies that the period is appli­cable to a holiday. (See Fig. 14.)
The broadcast function must be activated for the holidays configured on the HOLIDEF screen to work properly. Ac­cess the BRODEF screen from the EQUIPMENT CON­FIGURATION table and set the parameter that activates the BRODEF function to YES. Note that, when the chiller is connected to a CCN network, only one chiller or CCN de­vice can be configured to be the broadcast device. The con­troller that is configured to be the broadcaster is the device responsible for transmitting holiday, time, and daylight­savings dates throughout the network.
softkey.The
, PREVIOUS ,
softkey to
EF, EX, FA CHLR HOLDY01S CONFIGURATION SELECT
Fig. 21 — Example of Holiday Period Screen
To view or change the holiday periods for up to 18 dif-
ferent holidays, perform the following operation:
1. At the Menu screen, press SERVICE
to access the
SERVICE menu.
2. If not logged on, follow the instructions for entering your password. See the section, ToAccess the Service Screens, page 42. Once logged on, press NEXT until
EQUIPMENT CONFIGURATION is highlighted.
3. Press the SELECT softkey to access the EQUIP­MENT CONFIGURATION tables.
4. Press NEXT until HOLIDEF is highlighted. This is the holiday definition table.
5. Press SELECT to access the HOLIDEF screen. This screen lists 18 holiday tables.
6. Press NEXT to highlight the holiday table that you wish to view or change. Each table is one holiday pe-
riod, starting on a specific date, and lasting up to 99 days.
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7. Press SELECT to access the holiday table. The LID screen now shows the holiday start month and day, and
how many days the holiday period will last. See Fig. 24.
8. Press NEXT or PREVIOUS to highlight HOLIDAY START MONTH, START DAY,orDURATION.
9. Press SELECT to modify the month, day, or duration.
10. Press INCREASE or DECREASE to change the se­lected value.
If the checks are successful, the chilled water/brine pump relay is energized. Five seconds later, the condenser pump relay is energized. One minute later the PIC monitors the chilled water and condenser water flow switches, and waits until the WATER FLOW VERIFY TIME (operator config- ured, default 5 minutes) to confirm flow. See the SERVICE1 screen or Table2, Example 8.After flow is verified, the chilled water/brine temperature is compared to WATER/BRINE CON- TROL POINT plus DEADBAND. If the temperature is less than or equal to this value, the PIC turns off the condenser pump relay and goes into a RECYCLE mode.
If the water/brine temperature is high enough, the start-up sequence continues and checks the guide vane position. If the guide vanes are more than 6% open, the start-up waits until the PIC closes the vanes. If the vanes are closed, and the oil pump pressure is less than 3 psid (21 kPad), the oil pump relay is then energized. The PIC then waits a mini­mum of 15 seconds (maximum 5 minutes) to verify that the compressor oil pressure (OIL PRESSURE on the STA­TUS01 screen) has reached 15 psid (103 kPad). At the same time, the PIC waits up to 30 seconds to verify that the gear oil pressure (GEAR OIL PRESSURE on the STATUS04 screen) has reached 24 psi (166 kPa). After the oil pressures are verified, the PIC waits 10 seconds, and then the compressor start relay (1CR) is energized to start the compressor.
11. Press ENTER to save the changes.
12. Press EXIT to return to the previous menu.
START-UP/SHUTDOWN/
RECYCLE SEQUENCE (Fig. 22)
Local Start-Up —
is initiated by pressing the LOCAL on the default LID screen. Local start-up can proceed if the
OCCUPIED ? parameter on the STATUS01 table is set to YES and after the internal 15-minute start-to-start timer and the stop-to-start inhibit timer have expired.
The CHILLER START/STOP parameter on the STA- TUS01 screen may be overridden to start, regardless of the time schedule, in order to start the chiller locally. Also, the remote contacts may be enabled through the LID and closed to initiate a start-up.
Whenever the chiller is in LOCAL control mode, the PIC waits for the current time to coincide with an occupied time period as configured in the local time schedule (OCCPC01S) and for the remote contacts to close, if enabled. The PIC then performs a series of pre-start checks to verify that all pre-start alerts and safeties are within the limits shown in Table 3. The RUN STATUS line on the STATUS01 screen now reads STARTUP.
Local start-up (or a manual start-up)
menu softkey which is
LEGEND
A—START INITIATED — Prestart checks made; chilled water B—Condenser water pump started (5 seconds after A).
C—Water flows verified (one minute to 5 minutes maximum
D—Oil pressure verified (for compressor, 15 seconds minimum,
E—Compressor motor starts, compressor ontime and service
F—SHUTDOWN INITIATED — Compressor motor stops, guide
G—After the post-lube period, oil and evaporator pumps deener-
O/A — Restart permitted (both inhibit timers expired) (minimum of
pump started.
afterA). Chilledwater temperature checkedagainst controlpoint. Guide vaneschecked for closure. Oil pumpsstarted; tower fan control enabled.
300 seconds maximum, after C; for gear, within 30 seconds after C).
ontime starts, 15-minute inhibit timer starts (10 seconds after D). Start-in-12 hours counter advances by one.
vanesclose, compressor ontimeand service ontimestops,stop­to-start inhibit timer starts.
gized. Post-lube configurable to between one and 5 minutes after Step F.
15 minutes after E; minimum of 1 minute after F).
Fig. 22 — Control Sequence
43
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If any of these requirements are not met, the PIC aborts the start and displays the applicable pre-start mode of failure on the LID default screen. A pre-start failure does not ad­vance the STARTSIN 12 HOURS counter(STATUS01 screen). Any failure after the 1CR relay has energized causes a safety shutdown, advances the STARTS IN 12 HOURS counter by one, and displays the applicable shutdown status on the LID display.
Shutdown Sequence — The chiller shuts down if any
of the following occurs:
• the STOP button on the control panel is pressed for at least
one second. The alarm light blinks once to confirm the stop command.
• a recycle condition is present (see Chilled Water Recycle
Mode section).
• the OCCUPIED ? parameter on the STATUS01 screen reads
NO; that is, the chiller is not scheduled to run at the cur­rent time and date.
• the remote contact opens.
• the CHILLER START/STOP status is overridden to STOP
from the CCN network or the LID.
When a stop signal occurs, the shutdown sequence first stops the compressor by deactivating the start relay.A status message, SHUTDOWN IN PROGRESS, COMPRESSOR DEENERGIZED, displays. The guide vanes are then brought to the closed position. The oil pump relay and the chilled water/brine pump relay are shut down 60 seconds after the compressor stops. The condenser water pump shuts down when the condenser refrigerant temperature is less than the condenser pressure override minus 5 psi (34 kPa) or is less than or equal to the entering condenser water temperature plus 3° F (2° C). The stop-to-start timer now begins to count down. If the value of the start-to-start timer is still greater than the value of the start-to-stop timer, then the start-to­start time is displayed on the LID.
There are certain conditions during shutdown that can change this sequence:
• if the COMPRESSOR MOTOR LOAD (STATUS01 screen)
is greater than 10% after shutdown or the starter contacts remain energized, the oil pump and chilled water pump remain energized and the alarm is displayed
• if the ENTERING CONDENSER WA TER(STATUS01 screen)
temperature is greater than 115 F (46 C) at shutdown, the condenser pump is deenergized after the 1CR compressor start relay
• if the chiller shuts down due to low refrigerant tempera-
ture, the chilled water pump keeps running until the LEAV-
ING CHILLED WATER temperature is greater than the WATER/BRINE CONTROL POINT plus 5° F (3° C).
Automatic Soft StopAmps Threshold — The au-
tomatic soft stop amps threshold is an operator configured value that closes the guide vanes of the compressor auto­matically when a non-recycle, non-alarm stop signal occurs before the compressor motor is deenergized.
If the STOP button on the control panel is pressed, the guide vanes close to a preset amperage percent or until the guide vane is less than 2% open. The compressor then shuts off.
If the chiller enters an alarm state or if the compressor enters a RECYCLE mode, the compressor is deenergized immediately.
To activate the automatic soft stop amps threshold, access the SERVICE1screen. Set the SOFT STOP AMPS THRESH- OLD parameter value to the percent of amps at which the motor will shut down. The default setting is 100% amps (no soft stop).
When the automatic soft stop amps threshold is being ap­plied, a status message, SHUTDOWN IN PROGRESS, COM­PRESSOR UNLOADING, displays.
Chilled Water Recycle Mode — When the compres-
sor is running under light load conditions, the chiller may cycle off and wait until the load increases to restart again. This cycling is normal and is known as recycle. A recycle shutdown is initiated when any of the following occurs:
• when the chiller is operating under the control of the leav-
ing chilled water temperature (that is, when the ECW CON- TROL OPTION on the CONFIG screen is disabled), the differencebetween the LEAVINGCHILLED WATER tem- perature and ENTERING CHILLED WATER temperature is less than the RECYCLE SHUTDOWN DELTA T (found in the SERVICE1 table) and the LEAVING CHILLED WA- TER TEMP is below the WA TER/BRINECONTROL POINT, and the WATER/BRINE CONTROL POINT has not in- creased in the last 5 minutes
• when the chiller is operating under the control of the en-
tering chilled water temperature (that is, the ECW CON-
TROL OPTION is enabled), the difference between the ENTERING CHILLED WA TERtemperature and the LEAV­ING CHILLED WATER temperature is less than the RECYCLE SHUTDOWN DELTA T (found in the SERV-
ICE1 table) and the ENTERING CHILLED WATER tem- perature is below the WATER/BRINE CONTROL POINT, and the WATER/BRINE CONTROL POINT has not in- creased in the last 5 minutes
• when the LEAVING CHILLED WA TERtemperature is within
3° F (2° C) of the BRINE REFRIG TRIPPOINT. (See the SERVICE1 screen.)
When the chiller is in RECYCLE mode, the chilled water pump relay remains energized so that the chilled water tem­perature can be monitored for increasing load. The recycle control uses the RECYCLE RESTART DELTA T value to check when the compressor should be restarted. This is an operator-configured value that defaults to 5° F (3° C). The value can be viewed/modified on the SERVICE1 screen. The compressor restarts when:
• the chiller is operating under leaving chilled water tem-
perature control and the LEAVING CHILLED WATER temperature is greater than the WATER/BRINE CON- TROL POINT plus the RECYCLE RESTART DELTA T; or
• the chiller is operating under entering chilled water tem-
perature control and the ENTERING CHILLED WATER temperature is greater than the WATER/BRINE CON- TROL POINT plus the RECYCLE RESTART DELTA T.
Once these conditions are met, the compressor initiates a start-up, with a normal start-up sequence.
An alert condition may be generated if 5 or more recycles occur in less than 4 hours. Because excessive recycling can reduce chiller life, compressor recycling caused by ex­tremely low loads should be reduced. To accomplish this, use the time schedule to shut the chiller down during periods of known low load operation or increase the chiller load by running the fan systems. If the hot gas bypass is installed, adjust the values to ensure that hot gas is energized during light load conditions. Increase the RECYCLE RESTARTDELT A T value on the SERVICE1 screen to lengthen the time be­tween restarts.
The chiller should not be operated below design mini­mum load without a hot gas bypass installed on the chiller.
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Safety Shutdown — A safety shutdown is identical to
a manual shutdown with the exception that the LID displays the reason for the shutdown, the alarm light blinks continu­ously, and the spare alarm contacts are energized. A safety
shutdown requires that the RESET order to clear the alarm. If the alarm continues, the alarm
light continues to blink. Once the alarm is cleared, the op­erator must press the CCN the chiller.
Do not reset starter loads or any other starter safety for 30 seconds after the compressor has stopped. Voltage output to the compressor start signal is maintained for 10 seconds to determine starter fault.
or LOCAL softkeys to restart
softkey be pressed in
BEFORE INITIAL START-UP
Job Data Required
• list of applicable design temperatures and pressures (prod­uct data submittal)
• certified drawings of the chiller
• starting equipment details and wiring diagrams
• diagrams and instructions for special controls or options
• installation instructions
• pumpout unit instructions
Remove Shipping Packaging— Remove any pack-
aging material from the control center, power panel, guide vane actuator, motor and bearing temperature sensor covers, and the factory-mounted starter.
MOTOR
The motor may be provided with a shipping brace or shipping bolt (normally painted yellow) to prevent shaft movement during transit. It must be removed prior to operation. See Fig. 24.
Equipment Required
• mechanic’s tools (refrigeration)
• digital volt-ohmmeter (DVM)
• clamp-on ammeter
• electronic leak detector
• absolute pressure manometer or wet-bulb vacuum indica­tor (Fig. 23)
• 500 v insulation tester (megohmmeter) for compressor mo­tors with nameplate voltage of 600 v or less, or a 5000 v insulation tester for compressor motor rated above 600 v
Fig. 23 — Typical Wet-Bulb Type
Vacuum Indicator
Usingthe Economizer/Storage VesselandPump­outSystem—
fer Procedures section, page 63 for: pumpout system prepa­ration, refrigerant transfer, and chiller evacuation.
Refer to the Pumpout and Refrigerant Trans-
Fig. 24 — Shipping Bolt on Open Drive Motor
The motor should be inspected for any temporary, yellow caution tags with legends that convey information concern­ing actions necessary before the motor can be safely oper­ated.Any slushing compound on the shaft or other parts must be removed using a petroleum type solvent. Observe proper safety precautions.
NOTE: If a shipping bolt was used to restrain the rotor, the Westinghouse logo must be installed over the hole in the end­cover.The logo, the gasket, and hardware can be found with the parts that have been shipped loose. (Usually these are packed inside the main power lead box.)
EXTERNALGEAR — Remove any packaging material that may be on the external gear. Be sure that the breather is in place and free of any obstructions.
Motor Electrical Connection — All interconnect-
ing wiring for controls and grounding should be in strict com­pliance with both the (NEC) National Electrical Code and any local requirements.
The main lead box furnished with the motor has been sized to provide adequate space for making up connections be­tween the motor lead cables and the incoming power cables. The bolted joints between the motor lead and the power cables must be made and insulated in a workman-like manner fol­lowing the best trade practices.
Fabricated motors are provided with 2 stainless steel ground­ing pads drilled and tapped with the NEMA (National Elec­trical Manufacturers Association) 2-hole pattern (two tapped holes on 13⁄4in. centers). Fan cooled cast frames are provided with a special grounding bolt. The motor should be grounded by a proper connection to the electrical system ground.
1
⁄2-13
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The rotation direction of the motor is shown either on the motor nameplate or on the certified drawing. Information on the required phase rotation of the incoming power for this motor may also be found on the nameplate or drawing. If either is unknown, the correct sequence can be determined as follows. While the motor is uncoupled from the load, start the motor and observe the direction of rotation. Allow the motor to achieve full speed before disconnecting it from the power source. Refer to Motor Pre-Start Checks (page 51) for information concerning initial start-up. If the resulting rotation is incorrect, it can be reversed by interchanging any 2 incoming cables.
Motor Auxiliary Devices — Auxiliary devices such
as resistance temperature detectors, thermocouples, thermo­guards, etc., generally terminate on terminal blocks located in the auxiliary terminal box on the motor. Other devices may terminate on their own enclosures elsewhere on the mo­tor.Such information can be obtained by referring to the cer­tified drawing. Information regarding terminal designations and the connection of auxiliary devices can be obtained from the auxiliary drawings referenced by the outline drawing.
If the motor is provided with internal space heaters, to ensure proper heater operation, the incoming voltage sup­plied to them must be exactly as shown by either the name­plate on the motor or the outline drawing. Exercise caution any time contact is made with the incoming space heater cir­cuit, because space heater voltage is often automatically ap­plied when the motor is shut down.
Open Oil Circuit Valves — Check that the oil filter
isolation valves for both the compressor and external gear are open by removing the valve cap and checking the valve stem. (See Scheduled Maintenance, Changing the Oil Fil­ters, page 76.)
Do not use air or oxygen as a means of pressurizing the chiller. Some mixtures of HFC-134a and air can un­dergo combustion.
Leak Test the Chiller — Due to regulations regarding
refrigerant emissions and the dif ficulties associated with sepa­rating contaminants from refrigerant, Carrier recommends the following leak test procedures. See Fig. 25 for an outline of the leak test procedures. Refer to Tables 5A and 5B for refrigerant pressure/temperature values and to the Pumpout and Refrigerant Transfer Procedures section, page 63.
1. If the pressure readings are normal for the chiller condition:
a. Evacuate the nitrogen holding charge from the ves-
sels, if present.
b. Raise the chiller pressure, if necessary, by adding re-
frigerant until the pressure is at an equivalent satu­rated pressure for the surrounding temperature. Follow the pumpout procedures in the Pumpout and Refrig­erant Transfer Procedures section, page 63.
Never charge liquid refrigerant into the chiller if the pres­sure in the chiller is less than 35 psig (241 kPa). Charge as a gas only, with the cooler and condenser pumps run­ning, until this pressure is reached, using PUMPDOWN/ LOCKOUT and TERMINATE LOCKOUT mode on the PIC. Flashing of liquid refrigerant at low pressures can cause tube freeze-up and considerable damage.
Tighten All Gasketed Joints and Guide Vane Shaft Packing —
by the time the chiller arrives at the jobsite. Tighten all gas­keted joints and the guide vane shaft packing to ensure a leak-tight chiller.
NOTE: Check the chiller cold alignment. Refer to Chiller Alignment in the General Maintenance section, page 71.
Gaskets and packings normally relax
Check Chiller Tightness — Figure 25 outlines the
proper sequence and procedures for leak testing.
17EX chillers may be shipped with the refrigerant con­tained in the economizer/storage vessel and the oil charge shipped in the compressor. The cooler/condenser vessels have a 15 psig (103 kPa) refrigerant charge. Units may also be ordered with the refrigerant shipped separately, along with a 15 psig (103 kPa) nitrogen-holding charge in each vessel.
To determine if there are any leaks, the chiller should be charged with refrigerant. Use an electronic leak detector to check all flanges and solder joints after the chiller is pres­surized. If any leaks are detected, follow the leak test procedure.
If the chiller is spring isolated, keep all springs blocked in both directions in order to prevent possible piping stress and damage during the transfer of refrigerant from vessel to ves­sel during the leak test process or any time refrigerant is trans­ferred. Adjust the springs when the refrigerant is in operat­ing condition and when the water circuits are full.
RefrigerantTracer— Carrier recommends using an en-
vironmentally acceptable refrigerant tracer for leak testing with an electronic detector.
Ultrasonic leak detectors also can be used if the chiller is under pressure.
Run the chiller water pumps whenever transferring, re­moving, or charging refrigerant.
c. Leak test chiller as outlined in Steps3-9.
2. If the pressure readings are abnormal for chiller conditions:
a. Prepare to leak test chillers shipped with refrigerant
(Step 2h).
b. Check for large leaks by connecting a nitrogen bottle
and raising the pressure to 30 psig (207 kPa). Soap test all joints. If the test pressure holds for 30 minutes,
prepare to test for small leaks (Steps 2g - h). c. Plainly mark any leaks that are found. d. Release the pressure in the system. e. Repair all leaks. f. Retest the joints that were repaired. g. After successfully completing the test for large leaks,
remove as much nitrogen, air, and moisture as pos-
sible, given the fact that small leaks may be present in
the system. This can be accomplished by following
the dehydration procedure, outlined in the Chiller
Dehydration section, page 49. h. Slowly raise the system pressure to the equivalent satu-
rated pressure for the surrounding temperature but no
less than 35 psig (241 kPa) by adding HFC-134a
refrigerant. Proceed with the test for small leaks
(Steps 3-9).
3. Check the chiller carefully with an electronic leak detec­tor, or soap bubble solution.
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Page 47
47
Fig. 25 — 17EX Leak Test Procedures
Page 48
Table 5A — HFC-134a Pressure — Temperature (F)
TEMPERATURE (F) PRESSURE (psi)
0 6.50 2 7.52 4 8.60 6 9.66 8 10.79
10 11.96 12 13.17 14 14.42 16 15.72 18 17.06
20 18.45 22 19.88 24 21.37 26 22.90 28 24.48
30 26.11 32 27.80 34 29.53 36 31.32 38 33.17
40 35.08 42 37.04 44 39.06 46 41.14 48 43.28
50 45.48 52 47.74 54 50.07 56 52.47 58 54.93
60 57.46 62 60.06 64 62.73 66 65.47 68 68.29
70 71.18 72 74.14 74 77.18 76 80.30 78 83.49
80 86.17 82 90.13 84 93.57 86 97.09 88 100.70
90 104.40 92 108.18 94 112.06 96 116.02 98 120.08
100 124.23 102 128.47 104 132.81 106 137.25 108 141.79
110 146.43 112 151.17 114 156.01 116 160.96 118 166.01
120 171.17 122 176.45 124 181.83 126 187.32 128 192.93
130 198.66 132 204.50 134 210.47 136 216.55 138 222.76 140 229.09
Table 5B — HFC-134a Pressure — Temperature (C)
TEMPERATURE (C) PRESSURE (kPa)
-18.0 44.8
-16.7 51.9
-15.6 59.3
-14.4 66.6
-13.3 74.4
-12.2 82.5
-11.1 90.8
-10.0 99.4
-8.9 108.0
-7.8 118.0
-6.7 127.0
-5.6 137.0
-4.4 147.0
-3.3 158.0
-2.2 169.0
-1.1 180.0
0.0 192.0
1.1 204.0
2.2 216.0
3.3 229.0
4.4 242.0
5.0 248.0
5.6 255.0
6.1 261.0
6.7 269.0
7.2 276.0
7.8 284.0
8.3 290.0
8.9 298.0
9.4 305.0
10.0 314.0
11.1 329.0
12.2 345.0
13.3 362.0
14.4 379.0
15.6 396.0
16.7 414.0
17.8 433.0
18.9 451.0
20.0 471.0
21.1 491.0
22.2 511.0
23.3 532.0
24.4 554.0
25.6 576.0
26.7 598.0
27.8 621.0
28.9 645.0
30.0 669.0
31.1 694.0
32.2 720.0
33.3 746.0
34.4 773.0
35.6 800.0
36.7 828.0
37.8 857.0
38.9 886.0
40.0 916.0
41.1 946.0
42.2 978.0
43.3 1010.0
44.4 1042.0
45.6 1076.0
46.7 1110.0
47.8 1145.0
48.9 1180.0
50.0 1217.0
51.1 1254.0
52.2 1292.0
53.3 1330.0
54.4 1370.0
55.6 1410.0
56.7 1451.0
57.8 1493.0
58.9 1536.0
60.0 1580.0
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Page 49
4. Leak Determination — If an electronic leak detector in­dicates a leak, use a soap bubble solution, if possible, to confirm it. Total all leak rates for the entire chiller. Leak­age for the entire chiller at rates greater than the EPA (En­vironmental Protection Agency) guidelines or local codes must be repaired. Note the total chiller leak rate on the start-up report. This leak rate repair is only for new start­ups. See page 67 in General Maintenance section for rec­ommendations on checking leak rates and leak repairs for operating chillers.
5. If no leak is found during the initial start-up procedures, complete the transfer of refrigerant gas (see Pumpout and Refrigerant Transfer Procedures section, page 63.)
6. If no leak is found after a retest: a. Transfer the refrigerant to the economizer/storage ves-
sel or other storage tank and perform a standing vacuum test as outlined in the Standing Vacuum Test section, this page.
b. If the chiller fails this test, check for large leaks
(Step 2b).
c. Dehydrate the chiller if it passes the standing vacuum
test. Follow the procedure in the Chiller Dehydration section, below. Charge chiller with refrigerant (see Pumpout and Refrigerant Transfer Procedures section, page 63).
7. If a leak is found, pump the refrigerant back into the economizer/storage vessel or other storage tank.
8. Transfer the refrigerant until the chiller pressure is 18 in. Hg (41 kPa absolute).
9. Repair the leak and repeat the procedure, beginning from Step 2g to ensure a leak-tight repair. (If chiller is opened to the atmosphere for an extended period, evacuate it be­fore repeating the leak test.)
StandingVacuumTest— When performing the stand-
ing vacuum test or chiller dehydration, use a manometer or a wet bulb indicator. Dial gages cannot indicate the small amount of acceptable leakage during a short period of time.
1. Attach an absolute pressure manometer or wet bulb in­dicator to the chiller.
2. Evacuate the vessel (see Pumpout and Refrigerant Trans­fer Procedures section, page 63) to at least 18 in. Hg vac, ref 30-in. bar (41 kPa), using a vacuum pump or the pump­out unit.
3. Valve off the pump to hold the vacuum and record the manometer or indicator reading.
4. a. If the leakage rate is less than 0.05 in. Hg (0.17 kPa)
in 24 hours, the chiller is sufficiently tight.
b. If the leakage rate exceeds 0.05 in. Hg (0.17 kPa) in
24 hours, repressurize the vessel and test for leaks. If refrigerant is available in the other vessel, pressurize by following Steps 2-10 of Return Chiller To Normal Operating Conditions section, page 67. If not, use ni­trogen and a refrigerant tracer. Raise the vessel pres­sure in increments until the leak is detected. If refrig­erant is used, the maximum gas pressure is approximately 70 psig (483 kPa) at normal ambient temperature.
5. Repair the leak, retest, and proceed with dehydration.
Do not start or megohm-test the compressor motor or oil pump motor, even for a rotation check, if the chiller is under dehydration vacuum. Insulation breakdown and severe damage may result.
Dehydration is readily accomplished at room tempera­tures. Using a cold trap (Fig. 26) may substantially reduce the time required to complete the dehydration. The higher the room temperature, the faster dehydration takes place. At low room temperatures, a very deep vacuum is required for boiling off any moisture. If low ambient temperatures are involved, contact a qualified service representative for the dehydration techniques required.
Perform dehydration as follows:
1. Connect a high capacity vacuum pump (5 cfm
[0.002 m
3
/s] or larger is recommended) to the refrigerant charging valve (Fig. 6). Tubingfromthe pump to the chiller should be as short and as large in diameter as possible to provide the least resistance to gas flow.
2. Use an absolute pressure manometer or a wet bulb vacuum indicator to measure the vacuum. Open the shutoff valve to the vacuum indicator only when taking a reading. Leave the valve open for 3 minutes to allow the indicator vacuum to equalize with the chiller vacuum.
3. Open all isolation valves (if present), if the entire chiller is to be dehydrated.
4. With the chiller ambient temperature at 60 F (15.6 C) or higher,operate thevacuum pump until the manometer reads
29.8 in. Hg vac, ref 30 in. bar. (0.1 psia)(–100.61 kPa) or a vacuum indicator reads 35 F (1.7 C). Operate the pump an additional 2 hours.
Do not apply a greater vacuum than 29.82 in. Hg vac (757.4 mm Hg) or go below 33 F (0.56 C) on the wet bulb vacuum indicator. At this temperature/pressure, iso­lated pockets of moisture can turn into ice. The slow rate of evaporation (sublimation) of ice at these low temperatures/ pressures greatly increases dehydration time.
5. Valve off the vacuum pump, stop the pump, and record the instrument reading.
6. After a 2-hour wait, take another instrument reading. If the reading has not changed, dehydration is complete. If the reading indicates a vacuum loss, repeat Steps 4 and 5.
7. If the reading continues to change after several attempts, perform a leak test up to the maximum 180 psig (1241 kPa) pressure. Locate and repair the leak, and re­peat dehydration.
Chiller Dehydration — Dehydration is recommended
if the chiller has been open for a considerable period of time, if the chiller is known to contain moisture, or if there has been a complete loss of chiller holding charge or refrigerant pressure.
Fig. 26 — Dehydration Cold Trap
49
Page 50
Inspect Water Piping — Refer to the piping diagrams
provided in the certified drawings and the piping instruc­tions in the 17EX Installation Instructions manual. Inspect the piping to the cooler and condenser. Be sure that flow directions are correct and that all piping specifications have been met.
Piping systems must be properly vented, with no stress on the waterbox nozzles and covers. Water flows through the cooler and condenser must meet job requirements. Measure the pressure drop across the cooler and condenser.
Water must be within design limits, clean, and treated to ensure proper chiller performance and reduce the po­tential of tube damage due to corrosion, scaling, or ero­sion. Carrier assumes no responsibility for chiller dam­age resulting from untreated or improperly treated water.
CheckOptional Pumpout Compressor WaterPip­ing —
to ensure that the pumpout condenser water has been piped in. Check for field-supplied shutoff valves and controls as specified in the job data. Check for refrigerant leaks on field­installed piping.
If the optional pumpout system is installed, check
Check Relief Devices — Be sure that relief devices
have been piped to the outdoors in compliance with the lat­est edition of ANSI/ASHRAE (American National Stan­dards Institute/American Society of Heating, Refrigeration, andAir Conditioning Engineers) Standard 15 and applicable local safety codes. Piping connections must allow for access to the valve mechanism for periodic inspection and leak testing.
Relief valves are set to relieve at the 225 psig (1551 kPa) chiller design pressure.
Inspect Wiring
Do not check voltage supply without proper equipment and precautions. Serious injury may result. Follow power company recommendations.
Do not apply any kind of test voltage, including to check compressor oil pump even for a rotation check, if the chiller is under a dehydration vacuum. Insulation break­down and serious damage may result.
1. Examine wiring for conformance to job wiring dia­grams and to all applicable electrical codes.
2. Compare the ampere rating on the starter nameplate with the compressor nameplate. The overload trip amps must be 108% to 120% of the rated load amps.
3. The starter for a centrifugal compressor motor must con­tain the components and terminals required for PIC re­frigeration control. Check the certified drawings.
4. Check the voltage to the following components and com­pare to the nameplate values: compressor and gear oil pump contactors, pumpout compressor starter, and power panel.
5. Be sure that fused disconnects or circuit breakers have been supplied for the compressor and gear oil pumps, power panel, and pumpout unit.
6. Check that all electrical equipment and controls are prop­erly grounded in accordance with job drawings, certi­fied drawings, and all applicable electrical codes.
7. Make sure that the customer’s contractor has verified the proper operation of the pumps, cooling tower fans, and associated auxiliary equipment. This includes en­suring that motors are properly lubricated, have proper electrical supply, and have proper rotation.
8. Tighten all wiring connections to the plugs on the SMM, 8-input, and PSIO modules.
9. Ensure that the voltage selector switch inside the power panel is switched to the incoming voltage rating, 115 v. The 230 v alternative is not used.
10. On chillers with free-standing starters, inspect the power panel to ensure that the contractor has fed the wires into the bottom of the panel. Wiring into the top of the panel can cause debris to fall into the contactors. Clean and inspect the contactors if this has occurred.
Voltage to terminals LL1 and LL2 comes from a con­trol transformer in a starter built to Carrier specifica­tions. Do not connect an outside source of control power to the compressor motor starter (terminals LL1 and LL2). An outside power source will produce dangerous volt­age at the line side of the starter, because supplying volt­age at the transformer secondary terminals produces in­put level voltage at the transformer primary terminals.
CHECK INSULATION RESISTANCE — Before applying operating voltage to the motor, whether for checking rota­tion direction or for actual operation, measure the resistance of the stator winding insulation.
The test voltage, based on the motor operating voltage, is
as follows:
Operating Voltage DC Test Voltage
0- 900 500
901- 7000 1000
7001-14500 2500
This is particularly important if the motor may have been exposed to excessive dampness either during transit or while in storage. A ‘‘megger’’type instrument can be used to mea­sure the insulation resistance. The test voltage should be ap­plied between the entire winding (all winding leads connected together) and ground for approximately one minute with the winding at ambient temperature. The recommended mini­mum insulation resistance is determined as follows:
RM = KV + 1 Where RM = Recommended minimum insulation resis-
tance in megohms at 104° F (40° C) of the entire winding.
KV = Rated motor terminal to terminal voltage in
kilovolts (1000 volts = 1 KV).
On a new winding, where the contaminant-causing low insulation resistance is generally moisture, drying the wind­ing through the proper application of heat normally in­creases the insulation resistance to an acceptable level. The following methods are acceptable for applying heat to a winding:
1. If the motor is equipped with space heaters, energize the
heaters to heat the winding.
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2. Direct current (as from a welder) can be passed through the winding. The total current should not exceed approxi­mately 50% of the rated full load current. If the motor has only 3 leads, 2 must be connected together to form one circuit through the winding. In this case, one phase carries the full applied current and each of the others car­ries half of the applied current. If the motor has 6 leads (3 mains and 3 neutrals), the 3 phases should be con­nected into one series circuit.
3. Heated air can be blown either directly into the motor or into a temporary enclosure surrounding the motor. The source of heated air should preferably be electrical vs. fueled (such as kerosene), since a malfunction of the fuel burner could result in carbon entering the motor. Exer­cise caution when heating the motor with any source of heat other than self-contained space heaters. Raise the wind­ing temperature at a gradual rate to allow any entrapped moisture to vaporize and escape without rupturing the in­sulation. The entire heating cycle should extend over 15 to 20 hours.
Insulation resistance measurements can be made while the winding is being heated. However, they must be corrected to 104 F (40 C) for evaluation since the actual insulation re­sistance decreases with increasing temperature. For a new winding, the insulation resistance approximately halves for each 18° F (10° C) increase in insulation temperature above the dew point.
Motor Pre-Start Checks — To prevent damage to the
motor, the following steps must be taken before initial start­up:
1. Remove the shaft shipping brace (if supplied).
2. For sleeve bearing motors, the oil reservoir must be filled
with oil to the correct level. Use a rust and oxidation in­hibited, turbine grade oil. The viscosity of the oil must be 32 ISO (150 SSU) at 100 F (37.7 C). Oil capacity in each of the two bearings is 0.6 gal. (2.3 L) per bearing. Use of Carrier Oil Specification PP16-0 is approved, Carrier Part No. PP23BZ091 (Mobil DTE Light or Texaco Regal R+O32).
3. If possible, the shaft should be turned over by hand to
ensure that there is free rotation. On sleeve bearing mo­tors, the shaft should be moved to both extremes of its end play while it is being rotated, and the oil rings should be viewed through the viewing ports in the top of the bear­ing housing to verify free ring rotation.
4. On fan-cooled motors, the area around the external fan
inlet should be checked for loose debris that could be drawn into the fan during operation.
5. All external, factory-made, bolted joints should be checked
for any looseness that may have occurred in transit. Refer to Table 6 for recommended bolt torques.
Table 6 — Recommended Motor Fastener
Bolt size1⁄
Grade SAE GR 5
Torque*
Ft-lbs 3.5 7 12 31 63 115 180 275 550 960
N.m 4.7 9.5 16 42 85 156 244 373 746 1302
Tightening Torques
5
3
1
5
4
(
16
(
8
(
3
2
(
8
(
4
(
7
⁄8( 1( 11⁄3( 11⁄
2
External Gear Pre-Start Checks
There are 2 service valves on the external gear oil lines. See Fig. 27. Open both valves before starting the chiller.
External gears are shipped without oil. Before start-up, the gear must be filled with the proper type and amount of oil.
Before starting the external gear, check for any signs of mechanical damage, such as damaged piping or accessories. Then, follow the procedures listed below.
1. Fill the gear and auxiliary sump (if applicable) with oil
to the level indicated next to the sight glass. Fill the gear to the proper level as follows. Make sure all external pip­ing, gear oil cooler, and pumps are filled before confirm­ing the final oil level. Fill to the oil level indicated next to the glass sight gage.
Add oil through the gear inspection cover.The inspection cover must be removed in order to add oil. Take care to seal the cover when it is replaced.
Never attempt to add or replace oil while the ex­ternal gear is running unless a vertical sight glass is in use and the running oil level has been established and marked on the sight glass. Do not fill beyond the indicated oil level. Excess lubrication increases the churning effect and may result in overheating and subsequent thinning of oil and possible damage to the rotating components.
2. The viscosity of the oil must be 68 ISO. Use of Carrier
oil, specification PP16-2 is approved (Mobil DTE Heavy Medium or Texaco Regal UR & 068; Carrier Part No. PP23BB005).
3. Check that all electrical connections have been made and
are in working order. Check that all accessories are prop­erly mounted.
4. Turn the gear shafts by hand with a spanner wrench to
confirm that there are no obstructions to rotation.
5. Check that all couplings are properly aligned, mounted,
and keyed on the shaft extension.
6. Check that the inspection cover is securely fastened. See
Table 7 for recommended torque values.
7. For units operating in cold ambient temperatures, op-
tional heaters must be turned on and the oil temperature must be allowed to rise to at least 60 F (16 C) before start-up.
8. Start the chiller under as light a load as possible. Check
(
for oil leaks, unusual sounds, excessive vibration, and ex­cessive heat. If an operating problem develops, shut down immediately and correct the problem before restarting.
Bolt size M4 M6 M8 M10 M12 M10 M12 M16
Grade DIN 8.8 DIN 12.9
Torque*
*Torque values based upon dry friction.
Ft-lbs 2 8 15 35 65 45 92 225
N.m 2.7 11 20 47 88 61 125 305
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Fig. 27 — External Gear Lubrication System
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Page 53
Table 7 — Recommended Compressor and
External Gear Fastener Tightening Torques
FASTENER
DIAMETER (in.)
UNC Minimum Maximum
1
4
5
16
3
8
7
16
1
2
9
16
5
8
3
4
7
8
1 515 (698.3) 643 (871.9) 11⁄
8
1
1
4
13⁄
8
11⁄
2
3
1
4
2 2750 (3729.0) 3437 (4660.6)
1
2
4
21⁄
2
23⁄
4
*Dry fastener. NOTE: The torque values listed are to be used for end covers, seal
cages, shaft guards, inspection covers, and housing split line bolts, unless otherwise specified on the drawing or assembly instructions.
7 (9.5) 9 (12.2) 14 (19.0) 17 (23.1) 25 (33.9) 31 (42.0) 40 (54.2) 50 (67.8) 60 (81.4) 75 (101.7) 87 (118.0) 108 (137.0)
120 (162.7) 150 (203.4) 213 (288.8) 266 (360.7) 343 (465.1) 429 (581.7)
635 (861.1) 793 (1075.3)
896 (1215.0) 1120 (1518.7) 1175 (1593.3) 1468 (1990.6) 1560 (2115.4) 1950 (2644.2) 1828 (2478.8) 2286 (3099.8)
4022 (5453.8) 5027 (6816.6) 5500 (7458.6) 6875 (9322.5) 7456 (10,110.3) 9323 (12,642.0)
TORQUE*
Lb.-Ft. (N•m)
Carrier Comfort Network Interface — The Carrier
Comfort Network (CCN) communication bus wiring is sup­plied and installed by the electrical contractor. It consists of shielded, 3-conductor cable with drain wire.
The system elements are connected to the communication bus in a daisy chain arrangement. The positive pin of each system element communication connector must be wired to the positive pins of the system element on either side of it; the negative pins must be wired to the negative pins; the sig­nal ground pins must be wired to signal ground pins.
To attach the CCN communication bus wiring, refer to the certified drawings and wiring diagrams. The wire is in­serted into the CCN communications plug (COMM1) on the PSIO module. This plug also is referred to as J5.
NOTE: Conductors and drain wire must be 20AWG (Ameri­can Wire Gage) minimum stranded, tinned copper. Indi­vidual conductors must be insulated with PVC, PVC/nylon, vinyl, Teflon,or polyethylene.An aluminum/polyester 100% foil shield and an outer jacket of PVC, PVC/nylon, chrome vinyl, or Teflonwith a minimum operating temperature range of –20 C to 60 C is required. See table below for cables that meet the requirements.
MANUFACTURER CABLE NO.
Alpha 2413 or 5463
American A22503
Belden 8772
Columbia 02525
When connecting the CCN communication bus to a sys­tem element, a color code system for the entire network is recommended to simplify installation and checkout. The fol­lowing color code is recommended:
SIGNAL
Ground WHITE 2
CCN BUS CONDUCTOR
TYPE
INSULATION COLOR
+ RED 1 BLACK 3
PSIO MODULE
COMM 1 PLUG (J5) PIN NO.
Check Starter
BE AWARE that certain automatic start arrangements can engage the starter. Open the disconnect ahead of the starter in addition to shutting offthe chiller and pump.
Use the instruction and service manual supplied by the starter manufacturer to verify that the starter has been in­stalled correctly.
The main disconnect on the starter front panel may not deenergize all internal circuits. Open all internal and re­mote disconnects before servicing the starter.
Whenever a starter safety trip device activates, wait at least 30 seconds before resetting the safety. The microprocessor maintains its output to the 1CR relay for 10 seconds after starter safety shutdown to determine the fault mode of failure.
MECHANICAL STARTERS
1. Check all field wiring connections for tightness, clear-
ance from moving parts, and correct connection.
2. Check the contactor(s) to be sure they move freely.Check
the mechanical interlock between contactors to ensure that the 1S and 2M contactors cannot be closed at the same time. Check all other electro-mechanical devices, such as relays and timers, for free movement. If the devices do not move freely, contact the starter manufacturer for re­placement components.
3. Some dashpot-type magnetic overload relays must be filled
with oil at the jobsite. If the starter is equipped with de­vices of this type, remove the fluid cups from these mag­netic overload relays. Add dashpot oil to the cups per in­structions supplied with the starter.The oil is usually shipped in a small container attached to the starter frame near the relays. Use only dashpot oil supplied with the starter. Do not substitute.
Factory-filled dashpot overload relays need no oil at start­up, and solid-state overload relays do not have oil.
4. Reapply starter control power (not main chiller power)to
check the electrical functions. When using a reduced­voltage starter (such as a wye-delta starter) check the tran­sition timer for proper setting. The factory setting is 30 seconds (±5 seconds), timed closing. The timer is ad­justable in a range between 0 and 60 seconds, and set­tings other than the nominal 30 seconds may be chosen as needed (typically 20 to 30 seconds).
When the timer has been set, check that the starter (with relay 1CR closed) goes through a complete and proper
start cycle.
SOLID-STATE STARTERS
The solid-state starter is at line voltage when AC power is connected. Pressing the Stop button does not remove voltage. Use caution when adjusting the potentiometers on the equipment.
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1. Check that all wiring connections are properly termi­nated to the starter.
2. Verify that the ground wire to the starter is installed prop­erly and is of sufficient size.
3. Verify that the motors are properly grounded to the starter .
4. Check that all the relays are properly seated in their sockets.
5. Verify that the proper AC input voltage is brought into the starter per the certified drawings.
6. Verify that the initial factory settings (i.e., starting torque, ramp potentiometers, etc.) are set per the manufacturer’s instructions.
Compressor Oil Charge — If oil is added, it must
meet Carrier’s specification for centrifugal compressor use as described in the Scheduled Maintenance, Oil Specifica­tions section (page 77).
Oil may be added through the compressor oil drain and charging valve (Fig. 2, Item 22) using a pump. The pump must be able to lift from 0 to 150 psig (0 to 1034 kPa), or above chiller pressure. However, an oil charging elbow on the seal-oil return chamber (Fig. 4, Item 3) allows oil to be added without pumping. The seal oil return pump automati­cally transfers the oil to the main oil reservoir.
Oil should only be charged or removed when the chiller is shut down. Maximum oil level is the middle of the upper sight glass.
Power Up the Controls and Check the Com­pressor Oil Heater —
ible in the compressor before energizing the controls.A separate disconnect energizes the oil heater and the control circuit. When first powered, the LID should display the default screen within a short period of time.
The oil heater is energized by powering the control cir­cuit. This should be done several hours before start-up to minimize oil-refrigerant dilution. The oil heater is con­trolled by the PIC and is powered through a contactor in the power panel. Starters contain a separate circuit breaker to power the heater and the control circuit. This arrangement allows the heater to energize when the main motor circuit breaker is off for service work or extended shutdowns. The oil heater relay status can be viewed on the STATUS02screen on the LID. Oil sump temperature can be viewed on the LID default screen.
SOFTWARE VERSION — The software version is always labeled on the PSIO module and on the back side of the LID module. The software number also appears on both the CONTROLLER IDENTIFICATIONand LID CON­FIGURATION tables. See Fig. 15.
Be sure that an oil level is vis-
Set Up Chiller Control Configuration
Do not operate the chiller before the control configu­rations have been checked and a Control Test has been satisfactorily completed. Protection by safety controls cannot be assumed until all control configurations have been confirmed.
Input the Design Set Points — To modify the set
points, access the SETPOINT menu. (Press the MENU
SETPOINT base demand limit and the leaving chilled water, entering chilled water, and ice build set points. See Fig. 15 for the SETPOINT menu structure.
The PIC can control a set point according to ether the leav­ing or entering chilled water temperature. Tochange the type of control, access the CONFIG screen. Scroll down to high­light ECW CONTROL OPTION. To control the set point ac-
cording to the leaving chilled water, press the DISABLE softkey; to control the set point according to the entering
chilled water, press the ENABLE
softkeys.) From this menu, you can modify the
softkey.
and
Inputthe Local OccupiedSchedule (OCCPC01S)
To set up the occupied time schedule according to the
site requirements, access the SCHEDULE screen on the LID. (Press the MENU fault, factory-set schedule is 24 hours, occupied 7 days per
week including holidays. For more information about how to set up a time schedule, see the Controls section, page 11.
If the ice build option is being used, configure the ice build schedule (OCCPC02S).
If a CCN system is being installed or if a secondary time schedule is required, configure the CCN occupancy sched­ule (OCCPC03S to OCCPC99S). This task is normally done using a CCN Building Supervisor terminal, but it can also be done at the LID. For more information on CCN func­tions, see 17EX CCN supplement. Also, in this manual, see the section on Occupancy Schedule, page 32.
and SCHEDULE softkeys.) The de-
Input Service Configurations — The following con-
figurations are done from the SERVICE menu:
• password
• input time and date
• LID configuration
• controller identification
• service parameters
• equipment configuration
• automated control test PASSWORD — You must enter a password whenever you
access the SERVICE screens. The default, factory-set pass­word is1-1-1-1.Thepassword may be changed from the LID CONFIGURATION screen. To change the password:
1. Press the MENU
password and highlight LID CONFIGURATION. Press the SELECT
CONFIGURATION screen can be changed: BUS #,
ADDRESS #, BAUD RATE, US IMP/METRIC, and PASSWORD.
2. Use the ENTER
first digit of the password is highlighted on the LID screen.
3. To change the digit, press the INCREASE
DECREASE
press the ENTER
4. The next digit is highlighted. Change it and the third and
fourth digits in the same way you changed the first.
and SERVICE softkeys. Enter your
softkey. Only the last 5 entries on the LID
softkey to scroll to PASSWORD. The
or
softkey.When you see the digit you want,
softkey.
As you configure the 17EX chiller, write down all con­figuration settings. A log, such as the one shown on pages CL-1 to CL-12, is a convenient way to list configuration values.
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5. After the last digit is changed, the LID goes to the BUS # parameter. Press the EXIT
softkey to leave the
screen, record your password change, and return to the SERVICE menu.
BE SURE TO REMEMBER YOUR PASSWORD. Retain a copy of the password for future reference. If you forget your password, you will not be able to access the SERVICE menu unless you install and download a new PSIO module.
INPUT TIME AND DATE — Access the Time and Date table on the SERVICE menu. Input the present time of day, date, and day of the week. HOLIDAY TODAY should only be configured to YES if the present day is a holiday.
CHANGE THE LID CONFIGURATION IF NECESSARY — From the LID CONFIGURATION screen, the LID CCN address, units (English or SI), and password can be changed. If there is more than one chiller at the jobsite, change the LID address on each chiller so that each chiller has its own address. Note and record the new address. Change the screen to SI units as required, and change the password if desired.
To Change the LID Display From English to Metric Units — By default, the LID displays information in English units. To change to metric units:
1. Press the MENU and SERVICE softkeys. Enter your pass­word and highlight LID CONFIGURATION. Press the SELECT softkey.
2. Use the ENTER softkey to scroll to US IMP/METRIC.
3. Press the softkeys that correspond to the units you want displayed on the LID (e.g., US or METRIC ).
MODIFY CONTROLLER IDENTIFICATION IF NECES­SARY — The PSIO module address can be changed from the CONTROLLER IDENTIFICATION screen. If there is more than one chiller at the site, change the controller ad­dress for each chiller. Write the new address on the PSIO module for future reference.
INPUT EQUIPMENT SERVICE PARAMETERS IF NEC­ESSARY— The EQUIPMENT SER VICEtable has 3 screens: SERVICE1, SERVICE2, and SERVICE3.
Configure SERVICE1 Table —Access the SERVICE1 table to modify or view the following:
Chilled Medium Water or Brine? Brine Refrigerant Trippoint Usually 3° F (1.7° C) below design
Surge Limiting or
Hot Gas Bypass Option
Minimum Load Points
(T1/P1)
Full Load Points
(T2/P2)
Motor Rated Load Amps Per job data Motor Rated Line Voltage Per job data Motor Rated Line kW Per job data (if kW meter installed) Line Frequency 50 or 60 Hz Compressor Starter Type Reduced voltage or full? Stop-to-Start Timer Follow motor vendor recommenda-
NOTE:Other valuesareleft atthe defaultvalues. Thesemaybe changed by the operator as required. SERVICE2 and SERVICE3 tables can be modified by the owner/operator as required.
refrigerant temperature Is HGBP installed?
Per job data — See Modify Load Per job data — See Modify Load
tion for time between starts. See certified prints for correct value.
Points section Points section
Modify Minimum and Maximum Load Points (DT1/P1; D T2/P2) If Necessary —These pairs of chiller load points,
located on the SERVICE1table, determine when to limit guide vane travel or to open the hot gas bypass valve when surge prevention is needed. These points should be set based on individual chiller operating conditions.
If, after configuring a value for these points, surge pre­vention is operating too soon or too late for conditions, these parameters should be changed by the operator.
Example of configuration: Chiller operating parameters:
Refrigerant used: HFC-134a
Estimated Minimum Load Conditions:
44 F (6.7 C) LCW
45.5 F (7.5 C) ECW
43 F (6.1 C) Suction Temperature
70 F (21.1 C) Condensing Temperature
Estimated Maximum Load Conditions:
44 F (6.7 C) LCW
54 F (12.2 C) ECW
42 F (5.6 C) Suction Temperature
98 F (36.7 C) Condensing Temperature Calculate Maximum Load — Tocalculate the maximum load
points, use the design load condition data. If the chiller full load cooler temperature difference is more than 15° F (8.3° C), estimate the refrigerant suction and condensing tem­peratures at this difference. Use the proper saturated pres­sure and temperature for the particular refrigerant used.
Suction Temperature:
42 F (5.6 C) = 37 psig (255 kPa) saturated
refrigerant pressure (HFC-134a)
Condensing Temperature:
98 F (36.7 C) = 120 psig (1827 kPa) saturated
refrigerant pressure (HFC-134a)
Maximum Load DT2:
54 – 44 = 10° F (12.2 – 6.7 = 5.5° C)
Maximum Load DP2:
120 – 37 = 83 psid (827 – 255 = 572 kPad) To avoid unnecessary surge prevention, add about 10 psid
(70 kPad) to DP2 from these conditions:
DT2 = 10° F (5.5° C)
DP2 = 93 psid (642 kPad)
Calculate Minimum Load — Tocalculate the minimum load conditions, estimate the temperature difference that the cooler will have at 20% load, then estimate what the suction and condensing temperatures will be at this point. Use the proper saturated pressure and temperature for the particular refrig­erant used.
Suction Temperature:
43 F (6.1 C) = 38 psig (262 kPa) saturated
refrigerant pressure (HFC-134a)
Condensing Temperature:
70 F (21.1 C) = 71 psig (490 kPa) saturated
refrigerant pressure (HFC-134a)
Minimum Load DT1 (at 20% Load):
2° F (1.1° C) Minimum Load DP1:
71 – 38 = 33 psid (490 – 262 = 228 kPad) Again, to avoid unnecessary surge prevention, add 20 psid
(140 kPad) at DP1 from these conditions:
DT1 = 2° F (1.1° C)
DP1 = 53 psid (368 kPad)
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If surge prevention occurs too soon or too late, make the following adjustments:
LOAD
At low loads
(,50%)
At high loads
(.50%)
SURGE PREVENTION SURGE PREVENTION
OCCURS TOO SOON OCCURS TOO LATE
Increase P1 by
10 psid (70 kPad)
Increase P2 by
10 psid (70 kPad)
Decrease P1 by
10 psid (70 kPad)
Decrease P2 by
10 psid (70 kPad)
MODIFY EQUIPMENT CONFIGURATION IF NECES­SARY — The EQUIPMENT CONFIGURATION table has a number of screens to select, view, and/or modify. See Fig. 16 for the menu structure of this table. Carrier provides certified drawings that have the configuration values re­quired for specific jobsites. Modify these values only if requested.
CONFIG Screen Modifications — Change the values on this screen according to your job data. See certified drawings for the correct values. Modifications can include:
• chilled water reset
• entering chilled water control (Enable/Disable)
• 4 to 20 mA demand limit
• auto. restart option (Enable/Disable)
• remote contact option (Enable/Disable) LEAD/LAG Screen Modifications — Change the values on
this screen according to your job data. See certified draw­ings for specific values. Modifications can include:
• lead/lag selection
• load balance option
• common sensor option
• lag start/stop timers
• standby chiller option Owner-Modified CCN Tables—The following tables are de-
scribed for reference only. For detailed information on CCN operations, consult the CCN supplement for your chiller.
• OCCDEFCS Screen Modifications — This table contains the local and CCN time schedules, which can be modified here, or on the SCHEDULE screen as described previously.
• HOLIDEF Screen Modifications — This table configures the days of the year that holidays are in effect. See the holiday paragraphs in the Controls section for more details.
• BRODEF Screen Modifications — This table defines the outside-air temperature sensor and humidity sensor if one is to be installed. It also defines the start and end of day­light savings time. Enter the dates for the start and end of daylight savings, if required for your location. BRODEF also activates the Broadcast function, which enables the holiday periods defined on the LID to take effect.
• Other Tables — The ALARMDEF, CONS-DEF, RUNT­DEF, and WSMALMDF screens contain information for use with a CCN system. See the applicable CCN manual for more information on these screens. These screens can only be changed from a CCN Building Supervisor terminal.
CHECKVOLTAGESUPPLY—Access the STATUS 01 screen and read the LINE VOLTAGE: ACTUAL value. This reading should be equal to the incoming power to the starter. Use a voltmeter to check incoming power at the starter power leads. If the readings are not equal, an adjustment can be made by selecting the LINE VOLTAGE: ACTUAL parameter and then increasing or decreasing the value so that the value appear­ing on the LID is calibrated to match the incoming power voltage reading. Voltage can be calibrated only between 90 and 100% of the rated line voltage.
PERFORMAN AUTOMATED CONTROLTEST — Check the safety controls status by performing an automated con­trols test.Access the CONTROL TEST table from the SERV­ICE menu. This table has the following screens:
Automated Test As described above, a complete PSIO Thermistors Checks all PSIO thermistors only.
Options Thermistors Checks all options board thermistors. Transducers Checks all transducers. Guide Vane Actuator Checks the guide vane operation. Pumps Checks operation of pump output;
Discrete Outputs Activates all on/off outputs, all Pumpdown/Lockout Pumpdown prevents the low
Terminate Lockout Charges refrigerant and enables
FX Gear Oil Pump I/O Activates external gear main oil pump
control test.
either all pumps can be activated or individual pumps. Also tests the associated input such as flow or pressure.
at once or individually. refrigerant alarm during
evacuation so refrigerant can be removed from the unit, locks the compressor off. and starts the water pumps.
the chiller to run after pumpdown lockout.
and auxiliary oil pump (if supplied).
Automated Test — Before running this test, be sure that the compressor is in the OFF mode and the 24-v input to the SMM is in range (per line voltage percent on STATUS01 screen). Put the compressor in OFF mode by pressing the STOP pushbutton on the LID.
The automated test starts with a check of the PSIO ther­mistors and proceeds through the rest of the tests listed in the table below. The test not only checks readings, such as temperature and pressure readings, but also lets the operator know if certain devices, such as pumps or relays, are on or off and if all outputs and inputs are functioning. It also sets the refrigerant type.
As each test is executed, the LID display shows which test is running as well as other pertinent data. At the end of each test, the LID displays, OK TO CONTINUE? If a test indicates a problem, error, or device malfunction, the op­erator can choose to address the problem as the test is being done or note the problem and proceed to the next test.
NOTE: If during the control test the guide vanes do not open, check to see that the low pressure alarm is not active. (This causes the guide vanes to close.)
NOTE: The oil pump test will not energize the oil pump if cooler pressure is below –5 psig (–35 kPa).
When the test is finished, or the EXIT
softkey is pressed,
the test stops and the CONTROL TEST menu is displayed. If a specific automated test procedure is not completed, ac­cess that test by scrolling to it and selecting it to test the function when ready. The CONTROL TEST menu is de­scribed in more detail in Table 8.
Check Pumpout System Controls and Optional Pumpout Compressor —
trols include an on/off switch, a 3-amp fuse, the compressor overloads, an internal thermostat, a compressor contactor, and a refrigerant high pressure cutout. The high pressure cutout is factory set to open at 161 psig (1110 kPa) and reset at 130 psig (896 kPa). Check that the water-cooled condenser has been connected. Loosen the compressor holddown bolts to allow free spring travel. Open the compressor suction and discharge service valves. Check that oil is visible in the com­pressor sight glass. Add oil if necessary.
The pumpout system con-
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Table 8 — Control Test Menu Functions
TESTS TO BE DEVICES TESTED
PERFORMED
1. Automated Tests* Operates the secondthrough seventh
2. PSIO Thermistors Entering chilled water
3. Options Thermistors Common chilled water supply sensor
4. Transducers Evaporator pressure
5. Guide Vane Actuator Open
6. Pumps All pumps or individual pumps may be
7. Discrete Outputs All outputs or individual outputs may
8. Pumpdown/Lockout When using pumpdown/lockout,
9. Terminate Lockout Starts pumps and monitors flows.
10. FX Gear Oil Pump I/O
*During anyof the tests that arenot automated, an out-of-range read-
ing will have an asterisk (*) next to the reading and a message will be displayed.
†On open-drive chillers, differential pressure is the only oil pressure
displayed.
tests Leaving chilled water
Entering condenser water Leaving condenser water Discharge temperature Bearing temperature Motor winding temperature Oil sump temperature
Common chilled water return sensor Remote reset sensor Temperature sensor — Spare 1
Condenser pressure Oil pressure differential†
Close activated:
Oil pump — Confirm pressure Chilled water pump — Confirm flow Condenserwater pump —Confirm flow Auxiliary oil pump — confirm
pressure† be energized:
Hot gas bypass relay Oil heater relay Motor cooling relay Tower fan relay Alarm relay Shunt trip relay
observe freeze up precautions when removing charge.
Instructs operator as to which valves to close and when.
Startschilled water and condenserwa­ter pumps and confirms flows.
Monitors — Evaporator pressure
Turns pumps off after pumpdown. Locks out compressor.
Instructs operator as to which valves to open and when.
Monitors — Evaporator pressure
Terminates compressor lockout. Activates gear main oil pump; con-
firms pressure. Activatesoptionalgear auxiliary pump;
confirms pressure.
Condenser pressure Evaporator temperature during pumpout procedures
Condenser pressure Evaporator temperature during charging process
Spare 2 Spare 3 Spare 4 Spare 5 Spare 6 Spare 7 Spare 8 Spare 9
See the Pumpout and Refrigerant Transfer Procedures (page 63) and Pumpout System Maintenance sections (page 83) for details on transferring refrigerant, oil specifi­cations, etc.
HighAltitude Locations — Because the chiller is ini-
tially calibrated at sea level, it is necessary to recalibrate the pressure transducers if the chiller is to be operated at a high altitude location. Please see the calibration procedure in the Troubleshooting Guide section.
Charge Refrigerant into Chiller
The transfer, addition, or removal of refrigerant in spring isolated chillers may place severe stress on external pip­ing if springs have not been blocked in both up and down directions.
The 17EX chiller may have the refrigerant already charged in the economizer/storage vessels. If chiller is not shipped fully charged, refrigerant is shipped separately to conform with transportation regulations. The 17EX may be ordered with a nitrogen holding charge of 15 psig (103 kPa). Evacu­ate the entire chiller, and charge chiller from refrigerant cylinders.
The full refrigerant charge on the 17EX will vary with chiller components and design conditions as indicated on the job data specifications. An approximate charge may be found in Physical Data and Wiring Schematics section, page 99. The full chiller charge is printed on the chiller identification label.
Always operate the condenser and chilled water pumps during charging operations to prevent water in heat ex­changer tubes from freezing.
Use the CONTROLS TEST terminate lockout function to monitor conditions and start the pumps.
If the chiller has been shipped with a holding charge, add refrigerant through the refrigerant charging valve (Fig. 6) or to the pumpout charging connection. First evacuate the ni­trogen holding charge from the vessels. Charge the refrig­erant as a gas until the system pressure exceeds 35 psig (141 kPa). After the chiller is beyond this pressure, the re­frigerant should be charged as a liquid until all the recom­mended refrigerant charge has been added.
TRIMMING REFRIGERANT CHARGE — The 17EX is shipped with the correct charge for the design duty of the chiller.Trimming the charge can best be accomplished when the chiller is operating at design load. To trim, check the temperature differencebetween the leaving chilled water tem­perature and the cooler refrigerant temperature at full load design conditions. If necessary, add or remove refrigerant to bring the temperature difference to design conditions or a minimum differential.
INITIAL START-UP
Preparation—
1. Power is on to the main starter, oil pump relay (which
energizes both the compressor and gear oil pumps), tower fan starter, oil heater relay, and the chiller control center.
2. Cooling tower water is at proper level and at or below
design entering temperature.
Before starting the chiller,check that the:
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3. Chiller is charged with refrigerant and all refrigerant and all oil valves are in their proper operating position.
4. Gear oil, compressor oil, and motor bearing oil are at the proper levels in the reservoir sight glasses.
5. Compressor oil reservoir temperature is above 140 F (60 C) or refrigerant temperature plus 50° F (28° C).
6. Valves in the evaporator and condenser water circuits are open.
NOTE: If the water pumps are not automatic, make sure water is circulating properly.
7. Check the starter to be sure it is ready to start and that all safety circuits have been reset. Be sure to keep the starter door closed.
Do not permit water or brine that is warmer than 110 F (43 C) to flow through the cooler or condenser. Refrig­erant overpressure may discharge through the relief de­vices and result in the loss of refrigerant charge.
8. To prevent accidental start-ups, the CHILLER START/ STOP parameter is set to STOP at the factory.Access the STATUS01 screen and scroll to the CHILLER START/
STOP parameter. Press the RELEASE
softkey to enable
the chiller to start.
5. Check the main contactor for proper operation.
6. The PIC will activate an alarm for motor amps not sensed. Reset this alarm and continue with the initial start-up.
Check Motor Rotation
INITIAL MOTOR START-UP Initial Uncoupled Start-Up — The initial start-up of the mo-
tor should be made with the motor uncoupled. Verify that oil has been added to each bearing housing to the correct level.
1. If the motor is equipped with unidirectional fans (refer to the certified drawing) and verification of rotation direc­tion is required, do the following:
a. Start the motor and observe the rotation direction. See
Fig. 28.
b. Allow the motor to achieve full speed before discon-
necting it from the power source.
c. If the rotation direction must be changed, refer to the
Before Initial Start-Up, Motor Electrical Connection section, page 45. Otherwise, the motor can be re­started immediately after it has coasted to a stop.
Manual Operation of the Guide Vanes — Manual
operation of the guide vanes helps to establish a steady mo­tor current when calibrating the motor amps value.
To manually operate the guide vanes, override the target guide vane position (TARGET GUIDE VANE POS param- eter on the STATUS01 screen). Manual control is also in­dicated on the default screen on the run status line.
1. Access the STATUS01 screen and look at the TARGET
GUIDE VANE POS parameter. (Refer to Fig. 13). If the compressor is off, the value reads zero.
2. Move the highlight bar to the TARGET GUIDE VANE
POS parameter and press the SELECT
3. Press ENTER
to override the automatic target. The screen
softkey.
reads a value of zero. The word SUPVSR! flashes to in­dicate that manual control is in effect. The default screen also indicates that the guide vanes are in manual control.
4. To return the guide vanes to automatic mode, press the
SELECT
softkey; then press the RELEASE softkey.
After a few seconds, the word SUPVSR! disappears.
Dry Run to Test Start-Up Sequence
1. Disengage the main motor disconnect on the starter front
panel. This should only disconnect the motor power .Power to the controls, oil pumps, and starter control circuit should still be energized.
2. Look at the default screen on the LID. The status mes-
sage in the upper left corner should read, MANUALLY STOPPED. Press the CCN or LOCAL softkey to start. If MANUALLY STOPPED is not on the default screen
access the SCHEDULE screen and override the schedule or change the occupied time. Then, press the LOCAL
softkey to begin the start-up sequence.
3. Check that the chilled water and condenser water pumps
have energized.
4. Check that the oil pumps have started and have pressur-
ized the lubrication system. After the oil pumps have run about 15 seconds, the starter energizes and goes through its start-up sequence.
Fig. 28 — Correct Motor Rotation
2. After the initial start-up, monitor the bearing tempera­tures closely. Verify the free rotation of the oil rings on the sleeve bearings by observing them through the view­ing port in the top of the housing. The rate of rise in bear­ing temperature is more indicative of impending trouble than the actual temperature. If the rate of rise in tempera­ture is excessive or if the motor exhibits excessive vi­bration or noise, shut it down immediately and conduct a thorough investigation to find the cause before operating the motor again. If the bearing temperatures rise and mo­tor operation appears to be normal, continue operating the motor until the bearing temperatures stabilize.
The recommended limits on bearing temperature rise over ambient temperature are listed below:
Sleeve Bearing Temperature
As Measured By
A permanently installed
detector
A temporary detector on top
of the bearing sleeve near the oil ring
Temperature Rise
Over Ambient
Temperature
72° F (40° C)
63° F (35° C)
NOTE: When operating flood-lubricated sleeve bearings, the bearing temperature must not be allowed to exceed 185 F (85 C) total temperature.
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Under normal conditions, for the self-lubricating bear­ing, the rate of temperature rise should be from 20° to 25° F (11° to 14° C) during the first 10 minutes after starting up and approximately 40° F (22° C) over 30 minutes. The rate of bearing temperature rise is a function of the natural ventilation and operating conditions.
When the rate of bearing temperature rise is less than 2° F (1.1° C) per half-hour, the bearing temperature is considered to be stabilized.
If the total bearing temperature exceeds 195 F (91 C), the motor should be shut down immediately.
3. Any abnormal noise or vibration should be immediately investigated and corrected. Increased vibration (with the motor uncoupled from its load) can indicate a change in balance due to a mechanical failure or loose rotor part, a stator winding problem, a foundation problem, or a change in motor alignment.
4. Verify that the magnetic center indicator aligns with the shaft.
Initial Coupled Start-Up — After initial uncoupled start-up, take the following steps to ensure safe coupled operation:
1. Follow the procedure stated in the General Maintenance, ChillerAlignment section to align the motor to the driven chiller.
2. Prepare the coupling for operation according to the Disc Coupling Installation andAlignmentinstructions, this page. Note any match marks on the couplings and assemble ac­cordingly. For sleeve bearing motors, verify that the cor­rect limited end float coupling has been installed. The end float limits can be found on the certified drawing.
3. Ensure that all personnel are at a safe distance from ro­tating parts. Start the motor in accordance with instruc­tions supplied with the motor control.
4. If the motor rotor fails to start turning in a second or two, shut off the power supply immediately. This can result from:
a. too low a voltage at the motor terminals b. the load is too much for the rotor to accelerate c. the load is frozen up mechanically d. all required electrical connections are not made e. single-phase power has been applied f. any combination of the above.
Investigate thoroughly and take corrective action before attempting a restart.
5. Carefully observe the vibration of the bearing housing and any abnormal noise generator. Note that coupled motor vibration may not be the same as uncoupled vibration amounts. If coupled vibration is excessive, recheck the mounting and alignment.
6. Carefully observe the bearing temperature rise and the movement of the oil ring.
If the bearing temperatures rise and motor operation ap­pears normal, operation should continue until the bearing temperatures stabilize.
7. If possible, check the motor line currents for balance.
Note that each start time an induction motor starts, it is subjected to the full inrush of current along with heating of the stator and rotor windings. Each acceleration and re­peated start can produce more heat than is produced and dis­sipated by the motor under full load. The starting duty for which the motor is designed is shown on a nameplate mounted on the motor. Do not exceed this amount if long motor life is expected.
Abnormally low terminal voltage, excessive load torque, and/or excessive load inertia during motor start-up can cause lengthened acceleration times during which rotor ventilation is reduced. This can cause rotor damage or can lead to short­ened rotor life.
The temperature rating of the motor is shown on the main nameplate as a temperature rise above an ambient tempera­ture. If there is a service factor, it is also shown. If the motor temperature switch opens, investigate the situation before at­tempting to continue operation.
If the motor is a TEWAC (Totally Enclosed Water-to-Air Cooled) design, the maximum inlet water temperature and the water flow rate or gpm (gallons per minute) at the air cooler must be as shown on the certified drawing. Other­wise, the discharge air temperature from the cooler (actually the ambient air for the motor as shown by the main name­plate) could be too high for the motor to properly cool.
Disc Coupling Installation andAlignment Be-
fore installing the disc coupling, inspect it for any signs of damage during shipment. Check that all parts are available, as ordered. Cradle or support the coupling components dur­ing handling to avoid damage. Wrap the components for pro­tection. Keep flanges free of nicks and burrs. Read all the instructions and review this procedure before beginning the actual installation. Some steps apply only to certain types of couplings (e.g., high speed coupling).
Use only the bolts and nuts supplied by the coupling manufacturer.
1. Installing the Coupling Hubs (Keyed Mounting).
a. Check the hub bore and shaft for nicks and burrs; dress
if necessary. b. For taper bores, check the fit of the bore to the shaft. c. Fit keys precisely to the keyways in the shaft and hub.
Each key should have a tight fit on the sides with a
slight clearance on top. To maintain dynamic balance,
the keys should fill the keyways exactly and not be too
short or too long. d. Clean the hub bore and shaft. e. Heat the hub to expand the bore. DO NOT allow the
hub temperature to exceed 600 F (300 C). DO NOT
apply an open flame to any part of the coupling. Car-
rier recommends using an oven to heat the hub.
To avoid the risk of explosion, fire, or damage to the coupling and equipment and/or injury to per­sonnel, do not use an open flame or oil bath to ex­pand the hub. If heat is used at anytime for instal­lation, DO NOT ALLOW the hub temperature to exceed 600 F (300 C).
f. Place the hub in the proper position on the shaft. Hold
the hub in place as it cools. For tapered bores, verify the hub advance and install the shaft retaining nut.
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2. Offset and Angular Alignment — Reverse dial indication or optical methods of alignment (such as lasers) are rec­ommended. A cold alignment and a hot check (with cor­rections, if necessary) are required. The hub flange OD can be used to mount the alignment equipment and is ma­chined to be concentric to the coupling bore. It can be used as the reference diameter.
3. FinalAssembly — The terminology used to identify parts and the order of assembly may differ from one coupling style to another. Follow the instructions that apply to the coupling you are installing.
High Speed Coupling (Spacer Style):
a. Place the spacer in position between the hub flanges.
Place the disc packs between the flanges on both ends of the coupling.
b. Insert the disc pack bolt into the reamed hole of the
hub and through the disc pack bushing. See Fig. 29 (compressor side). The flat of the bolt head acts as a bolt lock with the hub body. Make sure the spacer is properly indexed for the large flange holes to receive the bolt ends. Tap the bolts lightly for full engagement until the heads rest on the hub flange surface. Repeat for the other bolts.
c. Place the spacing washers and disc pack nuts on the
bolts. Tightenall nuts evenly and in an alternating fash­ion to the torque specified in Table 9.
d. Place a spacing washer over a disc pack bolt. Insert
the bolt through the large hub flange hole and the disc pack bushing. See Fig. 29 (gear side). Tap the bolts lightly for full engagement. Repeat for the other bolts.
e. Place the disc pack nuts on the bolts. Tighten all nuts
evenly and in an alternating fashion to the torque speci­fied in Table 9.
Low Speed Coupling (Close-Coupled Style):
a. Place the disc pack and adapter in position over the
hub body diameter. The reamed holes in the adapter should be aligned with the large clearance holes in the hub as in the upper portion of Fig. 30. The large clear­ance holes in the adapter should be aligned with the reamed holes in the hub as shown in the lower portion of Fig. 30.
PACK
DISC PACK BOLT
HUB
MOTOR SIDE
FLANGE BOLT FLANGE NUT
ADAPTERSDISK
SPACING WASHER
DISC PACK NUT
GEAR SIDE
SHAFT PREPARATION (0.19 IN. [4.83 mm]
NOTES:
1. Compressor shaft should be in the thrust position and gear shaft
shouldbe on geometriccenter whencoupling is positionedas shown.
2. The taper is 1 inch per side for the driven unit bore (compressor
side).
Fig. 29 — Typical High Speed Coupling for 17FX
Compressor/External Gear (Spacer Style)
Table 9 — Disc Pack Nut Tightening Torques
Coupling
Size
204 1/2-20 55 75 45 60 304 5/8-18 115 155 90 120
*Light machine oil.
Nut
Size
Tightening
ft-lb
Torque
(dry)
N-m
Tightening
ft-lb
Torque
(lubed)*
N-M
NOTE: Motor rotor should be positioned on the mechanical center and gear shaft should be on geometric center when coupling is po­sitioned as shown.
Fig. 30 — Typical Low Speed Coupling for 17FX
Compressor/External Gear (Close Coupled)
b. Loosely assemble the disc pack bolts, nuts, and spac-
ing washers. Half of the bolts attach the adapter to the disc pack. Refer to Fig. 30. These bolts are inter­spersed by bolts that attach the disc pack to the hub.
c. Tighten all nuts evenly and in an alternating fashion to
the torque specified in Table 9.
d. Bring the driving and driven equipment together until
the flanges of the adapters just begin to touch. If there is a gap between the flanges at any point, adjust the axial position of the equipment until the amount of gap is cut in half to minimize the amount of axial mis­alignment.
e. Rotate the equipment shafts until the flange holes are
aligned.
f. Bolt the flanges together using the flange bolts and nuts.
See Fig. 30. Tighten all flange nuts evenly and in a alternating fashion to the torque specified in Table 10.
Table 10 — Flange Nut Tightening Torques
(Low Speed Couplings Only)
Coupling
Size
304 5/16-24 20 27 18 24
*Light machine oil.
Nut
Size
Tightening
ft-lb
Torque
(dry)
N-m
Tightening
ft-lb
Torque
(lubed)*
N-M
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4. General Recommendations a. Both disc couplings are designed to operate for ex-
tended periods without the need for lubrication or main­tenance. Visual inspection of the disc packs is enough to assess the operational condition of the coupling.
b. All machinery should be monitored to detect unusual
or changing vibration levels. Both couplings, under nor­mal operating conditions, have no wearing parts and retain their original balance quality.Any change in vi­bration levels should be investigated, and remedial ac­tion should be taken immediately.
5. Removal a. Disassemble the coupling in the reverse order of the
applicable assembly procedure.
b. Keyed couplings — Install a puller on the hub using
the tapped holes provided in the hub face. Pull the hub off the shaft.
IMPORTANT INFORMATION:
Coupling guards protect personnel. ALL COUPLINGS MUST BE COVERED WITH A GUARD ACCORD­ING TO OSHA (Occupational Safety and Health Administration) REQUIREMENTS. Safety guards are included with this product and must be installed at all times.
1. Recheck alignment after all foundation bolts and me­chanical connections are tightened.
2. Make sure all fasteners are properly installed and tightened.
3. Take the time to double check your work.
4. Only authorized disc coupling manufacturer replacement parts are to be used.
5. Call the disc coupling manufacturer for any clarifications or questions.
The self-locking nuts on the disc pack bolts should be replaced after they have been assembled and re­moved from the bolts 5 times.
Check Oil Pressure and Compressor Stop
1. When the motor is up to full speed, note the differential compressor oil pressure reading on the LID default screen. It should be between 18 and 30 psid (124 to 206 kPad).
2. Press the Stop button and listen for any unusual sounds from the compressor as it coasts to a stop.
Calibrate Motor Current Demand Setting
1. Make sure that the MOTOR RATED LOAD AMPS pa­rameter on the SERVICE1 screen has been configured. Place an ammeter on the line that passes through the mo­tor load current transfer on the motor side of the power factor correction capacitors (if provided).
2. Start the compressor and establish a steady motor current value between 70% and 100% RLA by manually over­riding the guide vane target value (TARGET GUIDE VANE POS parameter on the STATUS01 screen) and setting the chilled water set point (WATER/BRINE SETPOINT on the STATUS01 screen) to a low value. Do not exceed 105% of the nameplate RLA (rated load amps).
3. When a steady motor current value in the desired range is reached, compare the MOTOR RATED LOAD AMPS value on the STATUS01 screen to the actual amps shown on the ammeter on the starter. Adjust the amps value on the STATUS01 screen to match the actual value on the
starter ammeter, if there is a difference. Highlight the amps value; then, press the SELECT
INCREASE
to that indicated on the ammeter. Press ENTER the values are equal.
4. Release the target guide vane position to automatic mode. See the section on Manual Operation of the Guide Vanes, page 58, for instructions on how to do this.
or DECREASE softkey to bring the value
softkey. Press the
when
To Prevent Accidental Start-Up— The PIC can be
configured so that starting the unit is more difficult than just pressing the LOCAL
ice or whenever necessary. Access the STATUS01 screen, and highlight the CHILLER START/STOP param-
eter. Override the value by pressing SELECT
STOP
pears. When attempting to restart the chiller, remember to release the override. Access the STATUS01 screen and high­light CHILLER START/STOP. The 3 softkeys represent 3 choices:
• START - forces the chiller ON.
• STOP - forces the chiller OFF
• RELEASE - puts the chiller under remote or schedule
control.
RELEASE
additional information, see Local Start-Up, page 43. mand is in effect.
and ENTER softkeys. The word SUPVSR ap-
To return the chiller to normal control, press the
softkey; then, press the ENTER softkey. For
The default LID screen message indicates which com-
or CCN softkeys during chiller serv-
and then the
Hot Alignment Check — The operating temperatures
of various chiller components can affect the alignment of the compressor with the heat exchangers, gear, and driver. When all the chiller components have reached operating tempera­ture (after running at nearly full load for 4 to 8 hours), make a hot alignment check.
Using proper equipment and procedures, make the hot align­ment check with either assembled or disassembled cou­plings. The procedures are detailed in the General Mainte­nance section, page 67.
A clamping tool, Part No. TS-170, is available for check­ing alignment without disassembling the couplings. Check with your local Carrier representative.
Never operate the compressor or drive with the cou­pling guards removed. Serious injury can result from contact with rotating equipment.
Doweling — The size, quantity, and location of dowels
vary considerably with type and arrangement of gear and drive. Check your job data for specific doweling instruc­tions. Typical doweling practices are described in the Gen­eral Maintenance section.
Check Chiller Operating Condition — Check to
be sure that chiller temperatures, pressures, water flows, and oil and refrigerant levels indicate that the system is func­tioning properly.
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Instruct the Operator — Check to be sure that the op-
erator(s) understands all operating and maintenance proce­dures. Point out the various chiller parts and explain their function as part of the complete system.
COOLER-CONDENSER — Relief devices, temperature sen­sor locations, pressure transducer locations, Schrader fit­tings, waterboxes and tubes, and vents and drains.
ECONOMIZER/STORAGEVESSEL— Float chambers, re­lief valves, charging valve.
PUMPOUT SYSTEM — Transfer valves and pumpout sys­tem, refrigerant charging and pumpdown procedure, lubri­cation, and relief devices.
COMPRESSORASSEMBLY— Guide vane actuator, trans­mission, oil cooling system, temperature and pressure sen­sors, oil sight glasses, integral oil pump, isolatable oil filter, extra oil and motor temperature sensors, synthetic oil, and compressor serviceability.
COMPRESSOR LUBRICATION SYSTEM — Oil pump, cooler filter, oil heater, oil charge and specification, operat­ing and shutdown oil level, temperature and pressure, oil charg­ing connections, and seal oil chambers.
EXTERNALGEAR LUBRICATION SYSTEM — Oil pump, cooler/filter,oil charge and specification, operating and shut­down oil level, temperature and pressure, and oil charging procedures.
CONTROL SYSTEM — CCN and local start, reset, menu, softkey functions, LID operation, occupancy schedule, set points, safety controls, and auxiliary and optional controls.
AUXILIARYEQUIPMENT — Starters and disconnects, sepa­rate electrical sources, pumps, and cooling tower.
CHILLER CYCLES — Refrigerant, motor cooling, lubri­cation, and oil reclaim cycles.
MAINTENANCE — Scheduled, routine, and extended shut­downs; importance of a log sheet, water treatment, tube clean­ing, and maintaining a leak-free chiller.
SAFETYDEVICESAND PROCEDURES — Electrical dis­connects, relief device inspection, and handling refrigerant.
CHECK OPERATOR KNOWLEDGE — Start, stop,and shut­down procedures, safety and operating controls, refrigerant and oil charging, and job safety.
THIS MANUAL — Be sure that the operator is familiar with the contents of this manual.
OPERATING INSTRUCTIONS
Operator Duties
1. Become familiar withchiller refrigeration and related equip­ment before operating the chiller.
2. Prepare the system for start-up, start and stop the chiller, and place the system in a shutdown condition.
3. Maintain a log of operating conditions and document any abnormal readings.
4. Inspect the equipment, make routine adjustments, and per­form a controls test. Maintain the proper oil and refrig­erant levels.
5. Protect the system from damage during shutdown periods.
6. Maintain the set point, time schedules, and other PIC functions.
Prepare the Chillerfor Start-Up — Follow the steps
described in the Initial Start-Up section, page 57.
Starting the Chiller
1. Start the water pumps if they are not automatic.
2. On the LID default screen, press the LOCAL CCN
softkey to start the system. If the schedule indi­cates that the current time and date have been established as a run time and date (a condition referred to as ‘‘oc­cupied’’) and the 3- and 15-minute start timers have ex­pired, the start sequence will start. Follow the procedure described in the Start-Up/Shutdown/Recycle Sequence section, page 43.
or
Check the Running System — After the compres-
sor starts, monitor the LID display and observe the param­eters for normal operating conditions:
1. The oil reservoir temperature should be above 150 F (66 C) or refrigerant temperature plus 70° F (38° C) dur­ing shutdown and above 125 F (52 C) during compressor operation.
2. The bearing oil temperature (BEARING TEMPERA- TURE on the STATUS01 screen) should be 150 to 200 F (65 to 93 C). If the bearing oil temperature reads more than 210 F (99 C) with the oil pump running, stop the chiller and determine the cause of the high temperature. Do not restart the chiller until corrected.
3. The oil level should be visible in the lower sight glass when the compressor is running. At shutdown, oil level should be halfway in the lower sight glass.
4. The oil pressure should be between 18 and 30 psid (124 to 207 kPad) differential, as seen on the LID default screen. Typically the reading will be 18 to 25 psid (124 to 172 kPad) at initial start-up.
5. The condenser pressure and temperature vary withthechiller design conditions. Typically the pressure ranges between 57 and 135 psig (393 and 930 kPa) with a corresponding temperature range of 60 to 105 F (15 to 41 C) for R-134a. The condenser entering water temperature should be con­trolled to remain below the specified design entering wa­ter temperature to save on compressor kilowatt require­ments. The leaving condenser water temperature should be at least 20° F (11° C) above leaving chilled water temperature.
6. Cooler pressure and temperature also vary with the de­sign conditions. Typical cooler pressure ranges between 30 and 40 psig (206 and 275 kPa); temperature ranges between 34 and 45 F (1 and 8 C) for R-134a).
7. The compressor may operate at full capacity for a short time after the pulldown ramping has ended, even though the building load is small. The active electrical demand setting can be overridden to limit the compressor IkW, or the pulldown rate can be decreased to avoid a high de­mand charge for the short period of high demand operation. Pulldown rate can be based on kW rate (LOAD PULLDOWN %/MIN) or temperature rate (TEMP PULL­DOWN DEG/MIN) These parameters may be accessed on the CONFIG screen (see Table 2, Example 6).
8. The oil pump is energized once every 12 hours during shutdown periods to ensure that the shaft seal is filled with oil.
Stopping the Chiller
1. The occupancy schedule starts and stops the chiller au­tomatically once the time schedule is set up.
2. Pressing the Stop button on the control panel for one sec­ond causes the alarm light to blink once to confirm that the button has been pressed. Then, the compressor fol­lows the normal shutdown sequence as described in the Controls section. The chiller is now in the OFF mode.
The chiller will not restart until the CCN
LOCAL
softkey is pressed.
or
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NOTE: If the chiller fails to stop, in addition to action that the PIC initiates, the operator should close the guide vanes by overriding the guide vane target to zero (to reduce chiller load) and then by opening the main disconnect. Do not at­tempt to stop the chiller by opening an isolating knife switch. High intensity arcing may occur. Do not restart the chiller until the problem is diagnosed and corrected.
After Limited Shutdown — No special preparations
should be necessary. Follow the regular preliminary checks and starting procedures. Control power must be maintained in order to keep the oil temperature hot and all control safe­ties operational. The oil pump operates occasionally to keep the contact seal filled with oil to prevent refrigerant loss.
ExtendedShutdown — The refrigerant should be trans-
ferred into the economizer/storage vessel (see Pumpout and Refrigerant Transfer Procedures, this page) in order to re­duce chiller pressure and the possibility of leaks. Maintain a holding charge of 5 to 10 lbs (2.27 to 4.5 kg) of refrigerant within the cooler/condenser/compressor sections, to prevent air from leaking into the chiller.
If freezing temperatures are likely to occur in the chiller area, drain the chilled water, condenser water, and the pump­out condenser water circuits to avoid freeze-up. Keep the waterbox drains open.
Leave the oil charge in the chiller with the oil heater and controls energized to maintain the minimum oil reservoir temperature.
After Extended Shutdown — Be sure that the water
system drains are closed. It may be advisable to flush the water circuits to remove any soft rust which may have formed. This is a good time to brush the tubes if necessary.
Check the cooler pressure on the LID default screen, and compare it to the original holding charge that was left in the chiller. If (after adjusting for ambient temperature changes) any loss in pressure is indicated, check for refrigerant leaks. See the Check Chiller Tightness section, page 46.
Recharge the chiller by transferring refrigerant from the economizer/storage vessel. Follow the Pumpout and Re­frigerant Transfer Procedures section, this page. Observe
freeze-up precautions.
Carefully make all regular preliminary and running sys­tem checks. Perform a controls test before start-up. If the compressor oil level appears abnormally high, the oil may have absorbed refrigerant. Make sure that the oil tempera­ture is above 150 F (66 C) or above the cooler refrigerant temperature plus 70° F (39° C).
Cold Weather Operation — When the entering con-
denser water temperature is very low, the PIC can automati­cally cycle the cooling tower fans off to keep the tempera­ture up. Provide a way to control the condenser water temperature to the chiller either by arranging a tower bypass piping system and/or adding a tower water temperature con­trol system.
Manual Guide Vane Operation — It is possible to
operate the guide vane manually in order to check control operations or control the guide vanes in an emergency. This is done by overriding the target guide vane position. Access the STATUS01 screen on the LID and highlight TARGET GUIDE VANE POS. To control the position, enter the de­sired percentage of guide vane opening. Zero percent is fully
closed; 100% is fully open. To release the guide vanes to automatic operation, press the RELEASE
NOTE: Manual guide vane control allows the operator to manipulate the guide vane position and override the pull­down rate during start-up. However, motor current above the electrical demand setting, capacity overrides, and chilled wa­ter temperature below the control point will override manual
softkey.
guide vane control and close the guide vanes, if necessary. For descriptions of capacity overrides and set points, see the Controls section.
Refrigeration Log — A refrigeration log, such as the
one shown in Fig. 31, is a convenient way to track routine inspection and maintenance and provides a continuous record of chiller performance. It is an aid in scheduling routine main­tenance and in diagnosing chiller problems.
Keep a record of the chiller pressures, temperatures, and liquid levels on a log similar to Fig. 31. It is possible to au­tomatically record PIC data by using CCN devices such as the Data Collection module and a Building Supervisor ter­minal. Contact your Carrier representative for more information.
PUMPOUT AND REFRIGERANT TRANSFER
PROCEDURES
Preparation —
an optional pumpout compressor.The refrigerant can be pumped for service work to either the cooler/condenser/compressor sections or the economizer/storage vessel by using the pump­out system. The following procedures describe how to trans­fer refrigerant from vessel to vessel and perform chiller evacuations.
To prevent tube freeze-up, always be sure that the con­denser and cooler water pumps are operating whenever charging, transferring, or removing refrigerant from the chiller.
If the chiller water pumps are controlled by the PIC, ac­cess the CONTROL TEST table on the LID and use the PUMPDOWN/LOCKOUT screen or TERMINATE LOCK­OUT screen to perform the functions described below. If the chiller water pumps are not controlled by the PIC, they must be turned on and off manually.
When performing pumpout, do not leave the compres­sor unattended for long periods of time or loss of com­pressor oil may result. Periodically check oil level.
The 17EX may come equipped with
Operating the Optional Pumpout Compressor
1. Be sure that the suction and the discharge service valves
on the optional pumpout compressor are open (back seated) during operation. Figure 32 shows the location of these valves (valves 2, 3, 4, 5, and 8). Rotate the valve stem fully counterclockwise to open. Front seating the valve closes the refrigerant line and opens the gage port to com­pressor pressure.
2. Make sure that the compressor holddown bolts have been
loosened to allow free spring travel.
3. Open therefrigerant inlet valve on the pumpout compressor.
4. Oil should be visible in the compressor sight glass under
all operating conditions and during shutdown. If oil is low, add oil as described under Pumpout System Main­tenance section, page 83. The pumpout unit control wir­ing schematic is detailed in Fig. 33. The Optional Pump­out System is detailed in Fig. 34.
READING REFRIGERANT PRESSURES during pumpout or leak testing:
1. The LID display on the chiller control center is suitable
for determining refrigerant-side pressures and low (soft) vacuum. To measure evacuation or dehydration pres­sures, use a quality vacuum indicator or manometer to ensure the desired range and accuracy.This can be placed on the Schrader connections on each vessel by removing the pressure transducer.
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REFRIGERATION LOG CARRIER 17EX EXTERNALLY GEARED CENTRIFUGAL CHILLER
Plant
Chiller Serial No.
Chiller Model No. Refrigerant Type
REC. 1 REC. 2 REC. 3 REC. 4 REC. 5 REC. 6 REC. 7 REC. 8 REC. 9 TIME DATE OPERATOR INITIALS COOLER Refrigerant
Pressure Temperature
Water
Pressure In Pressure Out Pressure GPM Temperature In
Temperature Out CONDENSER Refrigerant
Pressure
Temperature Water
Pressure In
Pressure Out
Pressure GPM
Temperature In
Temperature Out COMPRESSOR Bearing Temperature Oil
Pressure Differential
Temperature (Reservoir)
Level Motor
FLA
Amps (or Vane Position) EXTERNAL GEAR Bearing Temperature Oil
Pressure Differential
Temperature (Reservoir)
Level Motor
FLA
Aps (or Vane Position
REMARKS: On an attached sheet, Indicate shutdowns on safety controls, repairs made, and oil or refrigerant added or removed. Include amounts. Include time, date, operator initials for each remark.
Fig. 31 — Refrigeration Log
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NOTE: Locationof pumpout compressor may varydepending on ma­chine arrangement.
9
DRIVE END
COOLER ISOLATION VALVE
CHILLER
11
7
CHARGER VALVE
REAR VIEW
10
COMPRESSOR END
Fig. 32 — Pumpout Unit Location and Valve Number Locations
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COMPRESSOR MOTOR
Hz Ph Volts Max. RLA 50 3 400 4.7
3 298 10.9 3 230 9.5
60
3 460 4.7 3 375 3.8
Fig. 33 — Pumpout Unit Wiring Schematic
LEGEND
1—Compressor Motor 2—Control Circuit C—Contactor
OL Compressor Overload RLA Rated Load Amps
T’stat — Internal Thermostat
Circuit Disconnect Disconnect
Compressor Terminal Contactor Terminal
Overload Terminal Pumpout Unit Terminal
VENT VALVE
VALVES
VALVES
CONDENSER WATER CONNECTIONS (FIELD PIPING)
CONDENSER DISCHARGE VALVE
CONTROL BOX (WIRING BY CONTRACTOR)
COMPRESSOR
Fig. 34 — Optional Pumpout Compressor
2. To determine economizer/storage vessel pressure, attach a 30 in.-0-400 psi (-101-0-2760 kPa) gage to the vessel.
3. Refer to Fig. 32 for valve locations and numbers.
Transfer, addition, or removal of refrigerant in spring­isolated chillers may place severe stress on external pip­ing if springs have not been blocked in both up and down directions.
Transferring Refrigerant into the Economizer/ Storage Vessel —
moving refrigerant from the cooler/condenser/compressor sec­tions into the economizer/storage vessel. This is normally done to prepare for service work on the cooler, condenser, or the compressor components or for long-term chiller shutdown.
These steps describe the method of
1. Isolate and push refrigerant into the economizer/storage vessel with the pumpout compressor. a. Valve positions: (Blank spaces indicate open valves).
VALVE 1 2 3 4 5 6 7 8 9 10 11 CONDITION CC CC C C
b. Turn off the chiller water pumps and pumpout con-
denser water.
c. Turn on pumpout compressor to push liquid out of the
cooler/condenser/compressor section.
d. When all liquid has been pushed into the economizer/
storage vessel, close the cooler isolation valve 7.
e. Access the CONTROL TEST table on the LID. Select
the PUMPDOWN/LOCKOUT screen. From this screen, turn on the chiller water pumps and view the chiller pressures.
f. Turn off pumpout compressor.
2. Evacuate refrigerant gas from the cooler/condenser/ compressor vessel.
a. Valve positions: close valves 2 and 5, open valves 3
and 4.
VALVE 1 2 3 4 5 6 7 8 9 10 11 CONDITION C C CCCC C
b. Turn on the pumpout condenser water. c. Run the pumpout compressor until the suction reaches
15 in. Hg (50 kPa abs). Monitor pressures on the LID
and on the refrigerant gages. d. Close valve 1. e. Turn off pumpout compressor. f. Close valves 3, 4, and 6. (All valves are now closed.) g. Turn off pumpout condenser water. h. Use the PUMPDOWN LOCKOUT screen on the LID
to turn off the chiller water pumps and to lock out the chiller compressor from operation.
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Transferring Refrigerant into the Cooler/ Condenser/CompressorSection —
scribe how to transfer refrigerant from the economizer/ storage vessel into the cooler/condenser/compressor section. This is normally done to prepare for service work on the economizer/storage vessel.
1. Isolate and push refrigerant into the cooler/condenser/ compressor section: a. Valve positions:
VALVE 1 2 3 4 5 6 7 8 9 10 11 CONDITION CCCCCC
b. Turn off chiller water pumps and pumpout condenser
water.
c. Turn on the pumpout compressor to push refrigerant
out of the economizer/storage vessel.
d. When all liquid refrigerant is out of the economizer/
storage vessel, close the cooler isolation valve 7.
e. Turn off the pumpout compressor.
2. Evacuate refrigerant from the economizer/storage vessel. a. Access the CONTROL TEST table on the LID. Select
the PUMPDOWN LOCKOUT screen. From this screen, turn on the chiller water pumps and monitor vessel pressures.
b. Valve positions: Close valves 3 and 4, open valves 2
and 5.
VALVE 1 2 3 4 5 6 7 8 9 10 11 CONDITION CC CCC C C
c. Turn on the pumpout condenser water. d. Run the pumpout compressor until the suction reaches
15 in. Hg (50 kPa abs). Monitor pressures on the LID
and on refrigerant gages. e. Close valve 6. f. Turn off the pumpout compressor. g. Close valves 1, 2, and 5 (all valves are now closed). h. Turn off the pumpout condenser water. i. From the CONTROL TEST table on the LID, turn off
the chiller water pumps and lock out the chiller com­pressor from operation.
These steps de-
Return Chiller to Normal Operating Conditions
1. Be sure that the vessel that was opened has been evacu­ated and dehydrated.
2. Access the CONTROL TEST table. From this table, se­lect the TERMINATE LOCKOUT function to view the vessel pressures and to turn on chiller water pumps.
3. Open valves 1, 3, and 6.
VALVE 1234567891011 CONDITION CCCCCCCC
4. Slowly open valve 5, gradually increasing pressure in the evacuated vessel to 35 psig (141 kPa) for HFC-134a. Feed refrigerant slowly to prevent freeze-up.
5. Perform a leak test at 35 psig (141 kPa).
6. Open valve 5 fully. Let the vessel pressures equalize.
VALVE 1 2 3 4 5 6 7 8 9 10 11 CONDITION C C CCCC C
7. Open valves 9 and 10.
8. Open valve 7 to equalize liquid refrigerant levels.
9. Close valves 1, 3, 5, and 6.
VALVE 1234567891011 CONDITION CCCCCC C C
10. Continue to use the TERMINATE/LOCKOUT function on the LID to turn off water pumps and enable the com­pressor to operate.
GENERAL MAINTENANCE
Refrigerant Properties —
the standard refrigerant in the 17EX.At normal atmospheric pressure, HFC-134a boils at −14 F (−25 C) and must, there­fore, be kept in pressurized containers or storage tanks. The refrigerant is practically odorless when mixed with air. This refrigerant is non-combustible at atmospheric pressure. Read the Material Safety Data Sheet (MSDS) and the latest ASHRAE Safety Guide for Mechanical Refrigeration to learn more about safe handling of this refrigerant.
Refrigerant HFC-134a will dissolve oil and some non­metallic materials, dry the skin, and, in heavy concen­trations, may displace enough oxygen to cause asphyxi­ation. When handling this refrigerant, protect the hands and eyes and avoid breathing fumes.
Refrigerant HFC-134a is
Adding Refrigerant — Follow the procedures de-
scribed in Charge Refrigerant into Chiller section, page 57.
Use the PUMPDOWN LOCKOUT function on the CON­TROL TEST table to turn on the chiller water pumps and lock out the compressor when transferring refrig­erant. Liquid refrigerant may flash into a gas and cause possible freeze-up when the chiller pressure is below 30 psig (207 kPa) for HFC-134a. If the water pumps are not controlled by the PIC, they must be controlled manually.
Removing Refrigerant — When the optional pump-
out system is used, the 17EX refrigerant charge may be trans­ferred into the economizer/storage vessel or another storage vessel. Follow procedures in the Pumpout and Refrigerant Transfer Procedures section when removing or transferring refrigerant.
Adjusting the Refrigerant Charge — If it is nec-
essary to add or remove refrigerant to improve chiller per­formance, follow theproceduresundertheTrimming Refrigerant Charge section.
Refrigerant Leak Testing — Because HFC-134a is
above atmospheric pressure at room temperature, leak test­ing can be performed with refrigerant in the chiller. Use an electronic detector, soap bubble solution, or ultra-sonic leak detector. To keep false readings to a minimum, be sure that the room is well ventilated and free from concentration of refrigerant. Before making any necessary repairs to a leak, transfer all refrigerant from the leaking vessel.
LeakRate — The ASHRAE recommendation is that chill-
ers should be immediately taken off line and repaired if the refrigerant leak rate for the entire chiller is more than 10% of the operating refrigerant charge per year.
Additionally,Carrier recommends that leaks totalling less than the above rate but more than a rate of 1 lb (0.5 kg) per year should be repaired during annual maintenance or when­ever the refrigerant is pumped over for other service work.
Test After Service, Repair, or Major Leak — If
all refrigerant has been lost or if the chiller has been opened for service, the chiller or the affected vessels must be pres­sure and leak tested. Refer to the Leak Test Chiller section (page 46) to perform a leak test.
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Refrigerant HFC-134a MUST NOT be mixed with air or oxygen and pressurized for leak testing. In general, this refrigerant should not be allowed to be present with high concentrations of air or oxygen above atmo­spheric pressures, because the mixture can undergo combustion.
REFRIGERANT TRACER — Use an environmentally ac­ceptable refrigerant as a tracer for leak test procedures.
TO PRESSURIZE WITH DRY NITROGEN — Another method of leak testing is to pressurize with nitrogen only and use a soap bubble solution or an ultrasonic leak detector to determine if leaks are present. This should only be done if all refrigerant has been evacuated from the vessel.
1. Connect a copper tube from the pressure regulator on the cylinder to the refrigerant charging valve. Never apply full cylinder pressure to the pressurizing line. Follow the listed sequence.
2. Open the charging valve fully.
3. Slowly open the cylinder regulating valve.
4. Observe the pressure gage on the chiller and close the regulating valve when the pressure reaches test level. Do not exceed 140 psi (965 kPa).
5. Close the charging valve on the chiller. Remove the cop­per tube if no longer required.
Repair the Leak, Retest, and Apply Standing Vacuum Test —
leaks with an electronic leak detector, soap bubble solution, or an ultrasonic leak detector. Bring the chiller back to at­mospheric pressure, repair any leaks found, and retest.
After retesting and finding no leaks, apply a standing vacuum test, and then dehydrate the chiller. Refer to the Standing Vacuum Test and Chiller Dehydration in the Before Initial Start-Up section, page 49.
After pressurizing the chiller, test for
Checking Guide Vane Linkage — Refer to Fig. 35.
If slack develops in the drive chain, eliminate backlash as follows:
1. With the chiller shut down (guide vanes closed), remove
the chain guard, loosen the actuator holddown bolts, and remove the chain.
2. Loosen the vane sprocket set screw and rotate the sprocket
wheel until the set screw clears the existing spotting hole.
3. Withthe set screw still loose, replace the chain, and move
the vane actuator to the left until all the chain slack is taken up.
4. Tighten the actuator holddown bolts and retighten the set
screw in the new position.
5. Realign the chain guard as required to clear the chain.
Contact Seal Maintenance (Refer to Fig. 36) —
During chiller operation, oil thatlubricatesthesealseepsthrough the space between the contact sleeve (Item 18) and the lock nut (Item 15). This oil slowly accumulates in an atmo­spheric oil chamber and is automatically returned to the sys­tem by a seal oil return pump.
Oil should never leak around the outer diameter of the contact sleeve (Item 18). If oil is found in this area, O-ring (Item 12) should be checked and replaced.
The oil passing through the shaft seal carries with it some absorbed refrigerant. As the oil reaches the atmosphere, the absorbed refrigerant is released from the oil as a vapor. For this reason, a detector will indicate the presence of a slight amount of refrigerant around the compressor shaft when­ever the chiller is running.
Fig. 35 — Electronic Vane Actuator Linkage
During shutdown, no refrigerant should be detected ex­cept for minute outgassing from residual oil in the seal area. There should be no oil seepage. If oil flow or the presence of refrigerant is noted while the chiller is shut down, a seal defect is indicated. Arrange for a seal assembly inspection by a qualified serviceman to determine the cause of the leak­age and make the necessary repairs.
SEAL DISASSEMBLY(Fig. 36) — Contact seal disassem­bly and repair should be performed only by well qualified compressor maintenance personnel. These disassembly in­structions are included only as a convenient reference for the authorized serviceman.
For ease of disassembly, refer to Fig. 36 while following these instructions.
1. Remove refrigerant.
2. Remove compressor shaft coupling hub and coupling spacer (if any).
3. The snap ring (Item 16) used forsealassembly/disassembly is clipped over three screws (Item 41) on the windage baffle (Item 7). Remove the snap ring and put it aside for now.
4. Remove the screws holding the windage baffle and the shaft end labyrinth (Item 8).
5. Remove the contact sleeve key (Item 11).
6. Using a snap ring tool, install the snap ring (Item 16) in the groove on the end of the contact sleeve (Item 18), as shown in Fig. 36.
7. Remove the tubing between the coupling (Item 20) and the atmospheric oil chamber. Loosen the bolts (Item 6) holding the coupling guard mounting ring (Item 4) and the seal housing (Item 3). The spring contact sleeve (Item 17) will push the housing out until the snap ring (Item 16) contacts the seal housing (Item 3). To avoid binding, loosen the bolts in a circular pattern until the spring stops pushing out on the housing. Then, remove 2 bolts that are 180 degrees apart. Replace them with a 1/2-13 all-thread rod to support the housing while the rest of the bolts are removed.
8. Remove the rest of the bolts, and remove the seal housing.
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LEGEND
1—Lubricating Tube 2A — O-Ring 2B — O-Ring 3—Seal Housing 4—Coupling Guard Mounting Ring 5—Plain 6—Hex Head Bolt, 7—Windage Baffle 8—Shaft End Labyrinth 9—Screw 10 — Screw, 10-24 × 11 — Key, Contact Sleeve 12 — O-Ring 13 — Compressor Shaft 14 — O-Ring 15 — Lock Nut 16 — Snap Ring (Service tool only; must be removed for operation) 17 — Spring Contact Sleeve 18 — Contact Sleeve 19 — Outer Carbon Ring 20 — Coupling (Connection to atmospheric oil chamber) 21 — Rotating Contact Ring 22 — Diaphragm Retainer 23 — Inner Seal Retaining Screw, 10-24×1lg(14Required) 24 — Gasket 25 — Diaphragm 26 — Inner Carbon Ring 27 — Inner Seal Spring 28 — Inner Seal Retainer 29 — Seal Gland Sleeve 30 — Spacer 31 — Journal Bearing Housing 32 — Journal Bearing 33 — Inner Seal Shim 34 — Inner Carbon Guide Ring 35 — O-Ring 36 — Inner Carbon Key 37 — Screw, 10-24 × 1 38 — Retaining Ring 39 — Seal Shoulder 40 — Compressor End Wall 41 — Thread Cut Screw, 8-32 × 42 — Screw,
1
⁄2-in. Washer (8 Required)
1
⁄2-13×4lg(8Required)
1
⁄4-20×3⁄4lg (4 Required)
1
⁄2lg
1
⁄4lg (2 Required)
1
5
⁄16-18×13⁄4lg (2 Required)
⁄4lg (3 Required)
Fig. 36 — Contact Seal
NOTE: Adjust shims (Item 33) to main­tain .525 ± .01 in. (13.3 ± .3 mm) dimen­sionwith shaftthrust toward driveand check carbon for +.06 minimum travel.
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9. Place a clean, lint-free cloth on a smooth, sturdy work surface. Place the seal housing assembly on the cloth with the face of the contact sleeve in contact with the cloth. While one person pushes down on the housing to compress the spring, another person must remove the snap ring. Then, slowly let the seal housing rise until the spring is fully extended.
10. Remove Items 2B and 12 (O-rings).
11. Slide the outer carbon ring (Item 19) off the shaft.
12. Remove the lubricating tube (Item 1) and gasket (Item 24).
13. Remove the inner carbon key (Item 36).
14. Remove the inner seal retaining screws (Item 23) and the diaphragm retainer (Item 22).
15. Using a spanner wrench, loosen the lock nut (Item 15). The lock nut has a right-hand thread. Remove the lock nut. The inner seal spring (Item 27) may push the con­tact ring part way out as the lock nut is loosened.
16. Carefully slide the rotating contact ring (Item 21) off the shaft. The ring slips onto the shaft with a very close tolerance and is prone to sticking. Slide it slowly to avoid a tight jam. To release, tap gently with a SOFT hammer.
17. Remove O-ring (Item 14). This O-ring will be crushed into a triangular shape. Since it is not an ordinary O-ring gland, this is normal.Always replace with a new O-ring.
18. The seal gland sleeve (Item 29) can be removed, but it is generally not necessary to do so. If the seal gland is removed, make sure it is reinstalled with the bevel (that contains the O-ring) facing outward.
19. The inner carbon ring (Item 26), the diaphragm (Item 25), the inner carbon guide ring (Item 34), and the inner seal spring (Item 27) can be removed as an as­sembly.The carbon ring is held to the guide ring by raised barbs on the guide ring. Carefully pull the carbon ring from the guide ring. The diaphragm can now be re­moved from the guide ring. Inspect the diaphragm for wear.
20. To remove the inner seal retainer (Item 28) and O-ring (Item 35), use 4 screws (Item 23) in the 4 threaded holes spaced evenly around the seal retainer to jack the part out of position.
If the inner seal shims are damaged, carefully measure them so that a shim package of the same thickness can be in­stalled.Thethicknessof the shim package should not be changed unless the compressor shaft and/or thrust bearing are re­placed. Replacing either of these items could affect the float of the inner seal. This float is adjusted by varying the thick­ness of the shim pack.
This completes the disassembly of the seal.
Clean all parts to be reused with solvent, coat with oil and place in a protected area until needed.
SEAL REASSEMBLY (Fig. 36) — Be sure that all gasket surfaces are clean and that all holes, including oil holes, are properly aligned between the gasket and mating flange. Coat the gasket with oil-graphite mixture to prevent sticking.
1. Install the inner seal retainer (Item 28) and O-ring (Item 35). Then, remove the bolts to allow installation of the inner seal assembly.
2. Replace the seal gland sleeve (Item 29) if it has been removed. Make sure that the plain side is against the shaft shoulder and that the beveled side is facing outward.
NOTE: If the seal gland sleeve is oriented improperly, refrigerant will leak under the contact ring.
3. Place the diaphragm (Item 25) over the inner seal re­tainer (Item 28). Withthe best lapped sealing face of the carbon away from the diaphragm and the notch for the key centered between two of the bolt holes in the dia­phragm, gently push the inner carbon ring (Item 26) into the inner carbon guide ring until it is tight against the diaphragm. Make sure that the diaphragm is not wrinkled or folded between the carbon and the retainer. Place the spring (Item 27) over the back of the guide ring. Place this assembly into the seal, and make sure that the car­bon face can travel a minimum of 0.06 inches (1.5 mm) in each direction from the outside edge of the seal gland sleeve (Item 29).
4. Install the O-ring (Item 14). Slide the rotating contact ring (Item 21) into position against the seal gland sleeve. Install the lock nut (Item 15) and tighten it with a spanner.
5. Gently rotate the inner seal assembly to line up the bolt holes in the diaphragm with the bolt holes in the inner seal retainer (Item 28). Place the diaphragm retainer over the diaphragm with the beveled side toward the dia­phragm. Install the 14 one-inch long screws (Item 23), leaving the top 2 holes on either side of the notch in the carbon open. Tighten to 2 ft-lb.
6. Install the inner carbon key (Item 36) using the 1-1/4-in. screws (Item 37). Tighten to 2 ft-lb.
7. Install the lubricating tube (Item 1) and gasket (Item 24).
8. Lightly coat the outer carbon ring with compressor oil. Then, slide the outer carbon ring (Item 19) into position against the rotating contact ring.
9. Install O-ring (Item 12).
10. Place the contact sleeve (Item 18) face down on a clean, lint-free cloth on a smooth, hard, work surface, and place the contact sleeve spring over the sleeve. Lightly coat the outside surface of the contact sleeve with compres­sor oil. While one person places the seal housing (Item 3) over the contact sleeve and presses the spring down, another person must install the snap ring (Item 16) in the groove around the small end of the con­tact sleeve. Once the snap ring is firmly seated in the groove, slowly let the seal housing rise until the snap ring rests against the housing. Rotate the sleeve in the seal housing until the key slot in the sleeve is in line with the bolt hole for the contact sleeve key (Item 11).
11. Install the O-ring (Item 2B) into its groove, and place the seal housing into position on the compressor. Guide rods can help accomplish this task. Place the coupling guard mounting ring (Item 4) over the seal housing, and fasten both in place with 8 hex-head bolts (Item 6). Draw in the housing against the seal spring by tightening the bolts in steps in a crisscross pattern to draw the housing evenly.
12. Once the bolts have been tightened, remove the snap ring from the contact sleeve, and set it aside.
13. Install the contact sleeve key (Item 11).
14. Install the shaft end labyrinth (Item 8) and the windage baffle using screws (Item 9). The split lines of the laby­rinth and windage baffle should be located 90 degrees apart.
15. Mount the snap ring (Item 16) on the screws (Item 41) near the inside surface of the windage baffle.
16. Reconnect the tubing from the atmospheric oil chamber to the coupling (Item 20).
The reassembly of the seal is complete. Run the oil pump to fill the seal, and rotate the shaft sev-
eral times by hand before leak testing.
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Chiller Alignment
ALIGNMENT METHODS — There are several established procedures for aligning shafts. The dial indicator method is presented here since it is considered to be one of the most accurate and reliable. Another faster and easier method for alignment involves using laser alignment tools and comput­ers. Follow the laser tool manufacturer’s guidelines when using the laser technique.
Where job conditions such as close-spaced shafts prohibit the use of dial indicators for coupling face readings, other instruments such as a taper gage may be used. The same pro­cedures described for the dial indicator may be used with the taper gage.
Shafts placed in perfect alignment in the non-operating (cold) condition will always move out of alignment to some extent as the chiller warms to operating temperature. In most cases, this shaft misalignment is acceptable for the initial run-in period before hot check and alignment can be made (see Hot Alignment Check section, page 61).
NOTE: The physical configuration of the 17FX compressor makes the oil sump temperature a more significant factor in alignment than the suction and discharge temperatures. There­fore, warm the sump oil to operating temperature (approxi­mately 140 F [60 C]), if possible, before beginning align­ment procedures.
General
1. Final shaft alignment must be within .002-in. (.05-mm)
TIR (Total Indicated Runout) in parallel. Angular align­ment must be within 0.00033 inches per inch of traverse (0.00033 mm per mm of traverse) across the coupling face (or inch of indicator swing diameter) at operating tem- peratures. For example, if a bracket-mounted indicator moves through a 10-in. diameter circle when measuring angular misalignment, the allowable dial movement will be 10 times 0.00033 for a total of 0.0033 in. (0.0033 mm).
2. Follow the alignment sequence specified in the Near
Final Alignment section.
3. All alignment work is performed on gear and drive equip-
ment. Once the compressor is bolted in a perfectly level position and is piped to the cooler and condenser, it must not be moved prior to hot check.
4. All alignment checks must be made with the equipment
hold-down bolts tightened.
5. In setting dial indicators on zero and when taking read-
ings, both shafts should be tight against their respective thrust bearings.
6. The space between coupling hub faces must be held to
the dimensions in Fig. 29 and 30.
7. Accept only repeatable readings. High Speed Coupling Alignment
1. Move the gear with the coupling attached into alignment
with the compressor coupling. The compressor must be in the thrust position and the gear must be centered be­tween the thrust collars when determining gear position relative to the compressor.Adjust the jackscrews to reach close alignment. Follow the procedures outlined in the Correcting Angular Misalignment and Correcting Paral­lel Misalignment sections.
2. A 5-in. long spacer hub is supplied between the gear and
compressor.Maintain the exact hub-to-hub distance speci­fied in Fig. 29.
3. Where the shaft ends are very close, a taper gage may be
used in place of the dial indicator.
4. Get the gear alignment as close as possible by using the
jackscrew adjustment.
Low Speed Coupling Alignment
1. Move the motor with the coupling attached into align­ment with the gear coupling. The motor must be in its mechanical center and the gear must be centered between the thrust collars when determining the motor position relative to the gear. Adjust the jackscrews to reach close alignment. Follow the procedure outlined in the Correct­ing Angular Misalignment and Correcting Parallel Mis­alignment sections.
2. Maintain the exact hub-to-hub distance as specified in Fig. 30.
3. Where the shaft ends are very close, a taper gage may be used in place of the dial indicator.
4. Get the motor alignment as close as possible by using the jackscrew adjustment.
NOTE: The drive shaft end-float at final drive position must not allow the coupling hub faces to make contact or the cou­pling shroud to bind.
PRELIMINARYALIGNMENT — To get within dial indi­cator range, roughly align the equipment as shown in Fig. 37 and as described below.
Place a straight edge across the OD of one coupling to the OD of the other. Measure the gap between the straight edge and the OD of the second coupling with a feeler gage. Then, by adding or removing shims at each corner, raise or lower the equipment by the measured amount.
In a similar manner, measure the shaft offset from side to side and jack the equipment over as required to correct.
Fig. 37 — Checking Preliminary Alignment
NEAR FINAL ALIGNMENT — Once the chiller compo­nents are within dial indicator range, the adjustments for mis­alignment should be made in a specific sequence. The four positions of alignment described below are arranged in the recommended order.
1. Angular in elevation — This alignment is adjusted with shims and is not readily lost in making the other adjustments.
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2. Parallel in elevation — This alignment is also made with shims, but it cannot be made while there is angular mis­alignment in elevation.
3. Angular in plan — This position can easily be lost if placed ahead of the two adjustments in elevation.
4. Parallel in plan — This adjustment cannot be made while there is still angular misalignment in plan and can easily be lost if elevation adjustments are made.
Correcting Angular Misalignment Preparation — Shaft angular misalignment is measured on
the face of the coupling hubs or on brackets attached to each shaft (see Fig. 38 and 39). Brackets are preferred since they extend the diameter of the face readings.
Attach a dial indicator to one coupling hub or shaft and place the indicator button against the face of the opposite hub. Position the indicator so that the plunger is at approxi­mately mid-position when the dial is set to zero. Both shafts should be held tightly against their thrust bearings when the dial is set and when readings are taken.
To be sure that the indicator linkage is tight and the button is on securely, rotate the coupling exactly 360 degrees. The dial reading should return to zero. Accept only repeatable readings.
Fig. 38 — Measuring Angular Misalignment
in Elevation
Fig. 39 — Measuring Angular Misalignment
in Elevation Using Brackets
Measurement— Occasionally,coupling faces may not be per­fectly true or may have been damaged in handling. To com­pensate for any such runout, determine the actual or ‘‘net’’ shaft misalignment as follows:
Check the opening at the top and at the bottom of the cou­pling faces (or at each side when making plan adjustment). Rotate both shafts exactly 180 degrees and recheck the open­ings. Record the difference. (Example below is in inches.)
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If the larger opening remains the same but changes from side to side, the shafts are in perfect alignment. The change in opening is due entirely to coupling runout, as above, or to a burr or other damage to the coupling face.
If the larger opening remains the same, and remains on the same side, the amount is entirely shaft (net) misalignment.
If the larger opening remains on the same side but changes amount, misalignment and runout are present. Add the two amounts and then divide by two to get the actual or net misalignment.
Obtain:
D — coupling face diameter in inches (or indicator but-
ton circle)
L — distance between front and rear holddown bolts
(inches)
M — net misalignment in inches
And:
Divide L, the bolt distance, by D, the coupling diameter. Multiply the result by M, the net misalignment.
L
S= × M
D
Example: Face diameter 5 in. (D). Distance between front
and rear holddown bolts 30 in. (L). Net misalign­ment in elevation .012 in. (M).
30 divided by 5 is 6 6 multiplied by .012 is .072 in. S = .072 in.
If the larger opening between coupling faces is at the top, place .072 in. of shim under each rear foot or remove .072 in. from the front footings to bring the couplings into angular alignment in elevation.
Tighten the holddown bolts and recheck the net misalignment.
The height of the shaft above the footings and the dis­tance the shaft extends beyond the equipment will not affect the calculations.
Determine the angular adjustment in plan by the same method of calculation. At this point, however, the procedure should include a correction for the change in coupling gap which always occurs in adjusting angular alignment (Fig. 40). By selecting the proper pivot point (see Fig. 41), the coupling gap can be kept at the dimension specified in the job data.
1. Pivot on the front bolt at the closed side of the couplings
to shorten the gap; pivot on the front bolt at the open side to lengthen it. It may sometimes be advantageous to pivot half the required amount on one front footing and half on the other.
2. Place a dial indicator against the rear foot as indicated in
Fig. 41.
3. Place a screw jack on the other rear foot to move the equip-
ment towards the indicator.
If the larger opening changes amount and also changes from side to side, subtract the smaller amount from the larger and divide by two to obtain the net misalignment.
Adjustment — Having obtained the net misalignment, the amount by which the equipment must be moved can now be calculated.
To determine:
S — amount of movement (in plan) or the thickness of
shim (in elevation) required.
S—Thickness of Shim Required L—Distance Between Front and
Rear Holddown Bolt in Inches
D—Diameter of Coupling in Inches M—Net Misalignment in Inches
Fig. 40 — Alignment Formula
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4. Loosen all holddown bolts except the pivot bolt. Turn the screw jack until the rear end of the equipment moves against the indicator by the desired amount.
5. Tighten the holddown bolts and recheck the indicator. If the reading has changed, loosen the three bolts and re­adjust. It may be necessary to over or undershoot the de­sired reading to allow for the effect of bolt tightening.
Fig. 41 — Adjusting Angular Misalignment in Plan
Correcting Parallel Misalignment Preparation — Attach the dial indicator to one shaft or cou-
pling hub and place the indicator button on the outside di­ameter of the other hub. The reach of the dial from one hub to the other should be parallel to the shafts, and the dial but­ton shaft should point directly through the center of the shaft on which it rests. Compress the plunger to about mid­position and set the dial at zero.
Check the tightness of the dial button and the indicator linkage by rotating the shaft to which the indicator is at­tached 360 degrees. The dial should return to zero. Check for repeatability.
Check for runout by rotating the hub on which the dial button rests 180 degrees. If the runout exceeds .001 total in­dicator reading, the hub should be removed and the shaft checked. Shaft runout must not exceed .001 TIR.
The effect of hub runout can be eliminated by locating a position on the half coupling where two readings 180 de­grees apart read zero. Rotate the coupling so that one zero point is at the top and the other at the bottom when checking for misalignment in elevation. Place the zero points side to side in a similar manner when checking for misalignment in plan.
Measurement — With dial set at zero in the top position, rotate the shaft to which the indicator is attached 180 de­grees. If the dial reading is plus, the shaft on which the but­ton rests is low. If the reading is minus, the shaft on which the button rests is high.
Never accept a single reading. Look for repeatability. Ro­tate the shaft several times to see if the reading remains the same. It is good practice to reverse the procedure and read from zero at the bottom.
Always rotate the shafts in the same direction when tak­ing readings. Backlash in the coupling teeth could cause some differences.
Adjustment — Divide the total indicator reading by two to obtain the exact amount of shaft offset. As illustrated in Fig. 42, the indicator will read the total of A plus B but the required shaft adjustment is only half of this as indicated by C.
Add or remove identical amounts of shims at all footings to bring the shaft to the proper elevation. Tighten all the hold­down bolts and recheck the readings. Parallel alignment must be within .002 TIR.
To correct parallel misalignment in plan, use a screw jack and dial indicator as shown in Fig. 42. With a front hold­down bolt as the pivot, move the rear of the equipment over. Then, with the rear holddown bolt on the same side acting as the pivot, move the front end of the equipment over by the same amount.
FINAL ALIGNMENT — The procedures and tolerance re­quirements for final alignment are the same as those de­scribed in the Near Final Alignment section. Final alignment is performed just prior to grouting and chiller hot check. All piping, including water and steam, must be completed, but the water and refrigerant charges need not be in place.
HOT ALIGNMENT CHECK General — When all chiller components have reached op-
erating temperature (after running near full load for from 4 to 8 hours), a hot alignment check must be made. Hot align­ment check may be made with couplings assembled or disassembled.
Disassembled Couplings
1. Shut down chiller.
2. With chiller hot, quickly disassemble couplings.
3. Check angular and parallel alignment in plan and eleva-
tion as described in the Near Final Adjustment section. Record the indicator readings (see page CL-12) and make necessary adjustments to bring alignment within .002 in. TIR and .00033 inches per in. of coupling face traverse (or in. of indicator swing). Follow procedures described in the Near Final Alignment section.
4. Reinstall couplings and run chiller until it again reaches
operating temperature.
5. Repeat steps 1 through 4 until alignment remains within
specified tolerances.
Assembled Couplings — If there is room on the shaft be­tween coupling and component to clamp a sturdy bracket, the arrangement illustrated in Fig. 43 maybe used. The clamps must have room to rotate with the shaft.
This method is quicker because the couplings do not have to be disassembled. In addition, eccentricity or coupling face runout are not problems since both shafts rotate together.
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Fig. 42 — Correcting Parallel Misalignment
When using brackets, the diameter in the alignment for­mula (see Near Final Alignment, Connecting Angular Mis­alignment section) will be that of the circle through which the dial indicator rotates.
1. Shut down the chiller.
2. With chiller at operating temperature, quickly install
brackets.
3. Check that alignment is within .002 in. TIR and
.00033 in. per in. of traverse (0.00033 mm per mm of traverse) across the diameter of measurement. Adjust align­ment as required. (Refer to Near Final Alignment section.)
4. Remove brackets and run chiller until operating tempera-
ture is again reached.
Fig. 43 —Alignment Check —Assembled Coupling
5. Recheck the alignment per steps 1 through 4 until it re­mains within the specified tolerances.
Be surethatcoupling guardsare replaced after these checks.
DOWELING Techniques — After a hot alignment check has been com-
pleted, the compressor, gear and drive must be doweled to their sole plates. Doweling permits exact repositioning of com­ponents if they have to be moved.
1. Doweling must be completed with equipment at maxi­mum operating temperature (full load).
2. Use No. 8 taper dowels to dowel the compressor, gear, and drive to the base. Use a
13
⁄32-in. drill and No. 8 taper reamer with straight flutes. Drill pilot hole and then ex­pand the pilot hole to final dimension.
1
3. Fit dowel so that
⁄16-in. of taper is left above the equip­ment foot. If dowel holes are re-reamed as a result of re­alignment, be sure dowels are tight and do not bottom.
4. Place dowels as nearly vertical as possible.
5. Coat the dowels with white lead or other lubricant to pre­vent rusting.
6. Tap dowel lightly into position with a small machinist’s hammer. A ringing sound will indicate proper seating.
Dowel the suction end of the compressor base, the two feet at the high speed end of the gear, and the drive feet in accordance with the drive manufacturer’s instructions. The number of dowels used in the drive is usually four, but some manufacturers require more.
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WEEKLY MAINTENANCE
Check the Lubrication System —
on the compressor reservoir sight glass, and observe the level each week while the chiller is shut down.
If the level goes below the lower sight glass, the oil re­claim system will need to be checked for proper operation. If additional oil is required, add oil as follows:
Oil may be added through the oil drain and charging valve (Fig. 2, Item 22) using a pump. However, an oil charging elbow on the seal-oil return chamber (Fig. 4) allows oil to be added without pumping. The seal oil return pump automati­cally transfers the oil to the main oil reservoir. A pump is required for adding oil against refrigerant pressure. The oil charge is approximately 20 gallons (76 L) for FX (size 531-
599) style compressors. The added oil must meet Carrier’s specifications. Refer to Changing theOilFiltersandOilChanges sections. Any additional oil that is added should be logged by noting the amount and date. Any oil that is added due to oil loss that is not related to service will eventually return to the sump, and must be removed when the level is high.
An oil heater is controlled by the PIC to maintain oil tem­perature above 150 F (65.5 C) or refrigerant temperature plus 70° F (38.9° C) (see the Controls section) when the com­pressor is off. The LID STATUS02 screen displays whether the heater is energized or not (OIL HEATER RELAY). If the PIC shows that the heater is ON, but the sump is not heating up, the power to the oil heater may be off or the oil level may be too low. Check the oil level, the oil heater contactor voltage, and oil heater resistance.
The PIC does not permit compressor start-up if the oil tem­perature is too low. The PIC continues with start-up only after the temperature is within limits.
After the initial start or a 3-hour power failure, the PIC allows the chiller to start once the oil is up to proper tem­perature, but uses a slow ramp load rate of 2° F (1.6° C) per minute.
Be sure that the isolation valves on the oil line near the filter(s) (Fig. 44) are fully open before operating the com­pressor.
There are no lubrication requirements for the FX disc coupling.
Check the oil level in the gear reservoir and observe the level each week. If additional oil is required, add oil as de­scribed in the Oil Changes section on page 77. The added oil must meet Carrier specifications. (SeeTable 11.)Do not over­fill the reservoir.Any additional oil added or removed should be logged by noting the amount and date.
Mark the oil level
Check the oil level in the motor bearings and observe the level each week. If additional oil is required, add oil as de­scribed in the Oil Changes section on page 77. The added oil must meet Carrier specifications. (See Table 11.) Any addi­tional oil added or removed should be logged by noting the amount and date.
SCHEDULED MAINTENANCE
Establish a regular maintenance schedule based on the ac­tual chiller requirements such as chiller load, run hours, and water quality. The time intervals listed in this section are of­fered as guides to service only.
Service Ontime — The LID displays a SERVICE ON-
TIME value on the STATUS01 screen. This value should
be reset to zero by the service person or the operator each time major service work is completed so that time span be­tween service can be tracked and viewed.
Inspect the Control Center — Maintenance is lim-
ited to general cleaning and tightening of connections. Vacuum the cabinet to eliminate dust build-up. If the chiller controls malfunction, refer to the Troubleshooting Guide section for control checks and adjustments.
Be sure power to the control center is off when cleaning and tightening connections inside the control center.
Check Safety and Operating Controls Monthly
To ensure chiller protection, the automated control test
should be done at least once per month. SeeTable 3 for safety control settings.
Changing the Oil Filters
COMPRESSOR OIL FILTER — Change this oil filter an­nually or whenever the chiller is open for repairs. The 17FX compressor has an isolatable filter so that the filter may be changed without removing refrigerant from the chiller. Use the following procedure.
1. Make sure the compressor is off and that the compressor
disconnect is open.
2. Disconnect the power to the oil heater and oil pump.
3. Close the valves to the filter.
4. Relieve the pressure from within the filter by using the
pressure connection on the oil feed line valve to the com­pressor. Run a hose from the connection to a bucket to catch the oil.
*Water out line is hidden behind oil out line.
Fig. 44 — Typical Compressor or Gear Oil Cooler/Filter
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5. Open the drain located on the shell of the cooler/filter. Run a hose from the drain to a bucket to catch the oil.
6. Once the pressure has been relieved and the oil drained, loosen the bolts that hold the cover on the filter body. Remove the old filter cartridges and replace with a new filter cartridge.Assemble the filter assembly (filters, spacer, and stopper assembly), and make sure that the spring is centered against the filter assembly as shown in Fig. 44.
7. Replace the drain fitting, using standard practices to en­sure a leak-tight joint. Evacuate the air from the cooler/ filter assembly.
8. Once the assembly has been evacuated, open the isola­tion valves.
9. Connect power to the oil heater and oil pump. The oil heater should turn on and warm the oil to 140 to 150 F (60 to 66 C). Operate the oil pump for 2 minutes.Add oil, if required, to keep the level up in the lower sight glass.
Oil should be visible in the reservoir sight glass during all
operating and shutdown conditions. EXTERNAL GEAR OIL FILTER — Change the oil filter
annually or whenever the chiller is open for repairs. The 17EX external gear lubrication system has an isolatable filter. Use the following procedure.
1. Make sure that the compressor is off and the compressor disconnect is open.
2. Disconnect the power to the oil heater, if equipped, and to the oil pump.
3. Close the line valves to the filter.
4. Relieve any pressure from within the filter by using the pressure connection on the oil feed line valve to the com­pressor. Run a hose from the connection to a bucket to catch the oil.
5. Open the drain located on the shell of the cooler/filter. Run a hose from the connection to a bucket to catch the oil.
6. Once the pressure has been removed and the oil drained, loosen the bolts that hold the cover on the filter body. Remove the oil filter cartridges and replace with new car­tridges. Assemble the filter assembly (filters, spacer, and stopper assembly), and make sure that the spring is cen­tered against the filter assembly, as shown in Fig. 44.
7. Replace the drain fitting, using standard practices to en­sure a leak-tight joint.
8. Open the isolation valves.
9. Connect power to the oil heater,if equipped, and oil pump. Operate the oil pump for 2 minutes. Add oil, if required, to keep the level up in the sight glass.
Oil should be visible in the reservoir sight glass during all
operating and shutdown conditions.
Oil Specifications — If oil is to be added, it must meet
the Carrier specifications shown in Table 11.
Oil Changes — Carrier recommends changing the oil
after the first year of operation and every three to five years thereafter as a minimum. Carrier also recommends a yearly oil analysis. However, if a continuous oil monitoring system is functioning and a yearly oil analysis is performed, the time between oil changes can be extended.
COMPRESSOR OIL
1. Open the control and oil heater circuit breaker.
2. Drain the oil reservoir by opening the oil charging valve, (Fig. 2, Item 22). Slowly open the valve against refrig­erant pressure.
3. Change the oil filter at this time. See the Changing the Oil Filters section, page 76.
4. Charge the chiller with approximately 20 gallons (76 L) of oil for FX (size 531-599) style compressors in order to bring the level to the middle of the upper sight glass (Fig. 2, Item 21). Turn on the power to the oil heater and let the PIC warm it up to at least 140 F (60 C). Operate the oil pump manually, through the control test, for 2 min­utes. The oil level should be between the lower sight glass and one-half full in the upper sight glass for shutdown conditions.
EXTERNAL GEAR OIL — Proper lubrication is vital to maintain gear drive performance.After 500 hours or 4 weeks of initial operation, whichever is first, the external gear drive should be thoroughly drained, flushed, and refilled with the proper lubricant. Under normal operating conditions, the lu­bricant should be changed every 2500 hours or 6 months, whichever comes first. This change frequency can be ex­tended if an oil sample analysis indicates a very limited deg­radation or contamination.
Table 11 — 17EX Chiller Oil Specifications
SPECIFICATION COMPRESSOR
Oil Type* Inhitited Polyolester-Based
Viscosity at 100 F (37 C)
Carrier Part Number PP23BZ107 PP23BZ091 PP23BB005 PP23BZ103 Carrier Specification PP47-12 PP16-0 PP16-2 PP47-31 Recommended
Manufacturer
Capacity 20 gal (76 L) 0.6 gal (2.3 L) per bearing 17 gal (41.6L) Compressor:
LEGEND SSU — Saybolt Universal Seconds *Oil type specified for chillers using HFC-134a refrigerant.
Synthetic Compressor Oil ISO 68
(300 SSU)
ICI, Emkarate RL68H Mobil, DTE Light
MOTOR SLEEVE
BEARINGS
Mineral-Based, Rust and Oxidation Inhibited Turbine Grade Oil
ISO 32 (150 SSU)
Texaco, Regal R & 0432 Sun Oil, Sunvis 932 Chevron, GST ISO 32
Rust and Oxidation Inhibited Oil
ISO 68 (300 SSU)
Mobil Oil, DTE Heavy Medium Texaco, Regal UR & 068 Chevron, OC #68 NOCO, Turbine T-68
EXTERNAL
GEAR
PUMPOUT
COMPRESSOR
AND OIL
SEPARATOR
Reciprocating Compressor Oil
ISO 68 (300 SSU)
Castrol Icematic SW68 ICI Emkarate RL68HP
4.5 pints (2.6 L)
Oil Separator:
1 pint (0.6 L)
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The lubricant should be drained while the gear is at op­erating temperature. The gear drive should be cleaned with a flushing oil. Used lubricant and flushing oil should be com­pletely removed from the system to avoid contaminating new oil.
To change the oil in the external gear:
1. Make sure that the compressor is off and the disconnect
for the compressor is open.
2. Disconnect the power to the oil heater, if equipped, and
the oil pump.
3. Open the drain located on the shell of the cooler/filter.
Run a hose from the drain to a bucket to catch the oil.
4. Once the pressure has been removed and the oil drained,
loosen the bolts that hold the cover on the filter body. Remove the old filter cartridges. Assemble the filter as­sembly (filters, spacer, and stopper assembly), and make sure that the spring is centered against the filter assembly as shown in Fig. 44.
5. Replace the drain fitting, using standard practices to en-
sure a leak-tight joint.
6. Open the isolation valves and add new oil. Refer to
Table 11 for oil specifications.
7. Connect power to the oil heater, if equipped, and the oil
pump. Operate the oil pump for 2 minutes. Add oil, if required, to keep the level up in the sight glass.
MOTOR SLEEVE BEARING AND PUMPOUT COM­PRESSOR OIL — For instructions on changing the motor sleeve bearing oil, refer to the section on Motor Mainte­nance, this page.
For instructions on changing the optional pumpout com­pressor and oil separator oil, refer to the section on Pumpout System Maintenance, page 83.
Inspect Refrigerant Float System — Inspect the
refrigerant float system once every 5 years or when the economizer/storage vessel is opened for service. Transfer the refrigerant into the cooler vessel or into a storage tank. There are two floats on the 17EX, one on each side of theeconomizer/ storage vessel. Remove the float access covers. Clean the chambers and valve assembly thoroughly. Be sure that the valves move freely. Make sure that all openings are free of obstructions. Examine the cover gaskets and replace if nec­essary. See Fig. 45 for a view of both floats.
InspectRelief ValvesandPiping — The relief valves
on this chiller protect the system against the potentially dan­gerous effects of overpressure. To ensure against damage to the equipment and possible injury to personnel, these de­vices must be kept in peak operating condition.
As a minimum, the following maintenance is required.
1. At least once a year, disconnect the vent piping at the valve outlet and carefully inspect the valve body and mecha­nism for any evidence of internal corrosion or rust, dirt, scale, leakage, etc.
2. If corrosion or foreign material is found, do not attempt to repair or recondition. Replace the valve.
3. If the chiller is installed in a corrosive atmosphere or the relief valves are vented into a corrosive atmosphere, make valve inspections at more frequent intervals.
Coupling Maintenance — Proper coupling mainte-
nance is important since the coupling supports the outboard end of the compressor high speed shaft. Clean and inspect both couplings for wear yearly. Misalignment causes undue noise and wear. Check alignment yearly, or more often if vibration or heating occur. Refer to Chiller Alignment sec­tion, page 71.
Never operate the drive without the coupling guards in place. Contact with a rotating shaft or coupling can cause serious injury.
Motor Maintenance — A carefully planned and ex-
ecuted program of inspection and maintenance will do much to ensure maximum motor availability and minimum main­tenance cost. If it becomes necessary to repair, recondition, or rebuild the motor, it is recommended that the nearest West­inghouse repair facility be consulted.
In addition to a daily observation of the appearance and operation of the motor, it is recommended that a general in­spection procedure be established to periodically check the following items:
• cleanliness, both external and internal
• stator and rotor (squirrel-cage) windings
• bearings
Fig. 45 — Typical Float Valve Arrangement
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CLEANLINESS — On open ventilated motors, screens and louvers over the inlet air openings should not be allowed to accumulate any build-up of dirt, lint, etc., that could restrict free air movement. Screens and louvers should never be cleaned or disturbed while the motor is in operation because any dis­lodged dirt or debris can be drawn directly into the motor.
If the motor is equipped with air filters, they should be replaced (disposable type) or cleaned and reconditioned (per­manent type) at a frequency that is dictated by conditions. It is better to replace or recondition filters too often than not often enough.
Washing motors using a water spray is not recom­mended. Manual or compressed air cleaning is pre­ferred. If it becomes necessary to spray-wash a motor, it should be done with extreme care. Do not aim high pressure sprays directly at air inlet openings, conduit con­nections, shaft seals, or gasketed surfaces to prevent the possibility of forcing water inside the chiller.
The stator windings of motors with open ventilation sys­tems can become contaminated with dirt and other sub­stances brought into the motor by the ventilating air. Such contaminants can impair cooling of the winding by clogging the air passages in the winding end-turns and vent ducts through the stator core and by reducing heat transfer from the wind­ing insulation surfaces to the cooling air. Conducting con­taminants can change or increase electrical stresses on the insulation, and corrosive contaminants can chemically at­tack and degrade the insulation. This may lead to shortened insulation life and stator failure.
Several satisfactory methods of cleaning stator windings and stator cores are offered below:
Compressed Air — Low pressure (30 psi maximum), clean (no oil) dry air can be used to dislodge loose dust and par­ticles in inaccessible areas such as air vent ducts in the stator core and vent passages in the winding end-turns. Excessive air pressure can damage insulation and drive contaminants into inaccessible cracks and crevices.
Vacuum — Vacuum cleaning can be used, both before and after other methods of cleaning, to remove loose dirt and debris. It is a very effective way to remove loose surface contamination from the winding without scattering it. Vacuum cleaning tools should be nonmetallic to avoid any damage to the winding insulation.
Wiping — Surface contamination on the winding can be re­moved by wiping, using a soft, lint-free wiping material. If the contamination is oily, the wiping material can be moist­ened (not dripping wet) with a safety-type petroleum sol­vent, such as Stoddard solvent. In hazardous locations, a solvent such as inhibited methyl chloroform may be used, but must be used sparingly and immediately removed. While this sol­vent is non-flammable under ordinary conditions, it is toxic. Proper health and safety precautions should be followed while using it.
Solvents of any type should never be used on windings provided with abrasion protection. Abrasion protection is a grey, rubber-like coating applied to the winding end-turns.
Adequate ventilation must always be provided in any area where solvents are being used to avoid the danger of fire, explosion, or health hazards. In confined areas (such as pits) each operator should be provided with an air line respirator, a hose mask, or a self-contained breath­ing apparatus. Operators should wear goggles, aprons, and suitable gloves. Solvents and their vapors should never be exposed to open flames or sparks and should always be stored in approved safety containers.
SLEEVE BEARINGS Oil Changing — The oil reservoirs of the self lubricated bear-
ings should be drained and refilled every 6 months. More frequent changes may be needed if severe oil discoloration or contamination occurs. In conditions where contamination does occur, it may be advisable to flush the reservoir with kerosene to remove any sediment before new oil is added. Proper care must be taken to thoroughly drain the reservoir of the flushing material before refilling it with the new oil.
Refill the reservoir to the center of the oil sight glass with a rust and oxidation inhibited, turbine grade oil. The viscos­ity of the oil must be 32 ISO (150 SSU) at 100 F (37.7 C). Oil capacity in each of the 2 bearings is 0.6 gal. (2 l) per bearing. Use of Carrier Oil Specification PP16-0 is ap­proved (refer to Table 11).
Disassembly — The bearing sleeve is spherically seated and self-aligning. The opposite drive end bearing is normally in­sulated for larger motors (or when specified). On some mo­tors, the insulation is bonded to the spherical seat of the bearing housing. Use extreme care when removing the sleeve from the insulated support to avoid damaging this insulation.
Note that some bolts and tapped holes associated with the bearing housings, bearing sleeves, and seals are metric.
The following procedure is recommended for removing the bearing sleeve.
1. Remove the oil drain plug in the housing bottom and drain the oil sump.
2. Remove all instrumentation sensors that are in contact with the bearing sleeve. These include resistance tem­perature detectors, thermocouples, temperature relay bulbs, thermometers, etc.
3. Remove the end cover.
4. Remove the socket head bolts holding the bearing cap and the inner air seal together at the horizontal split. The front end cover plate must also be removed if the front bearing is being disassembled. Remove the bearing cap and top half of the inner air seal by lifting straight up to avoid damaging the labyrinth seals. Place themon a clean, dry surface to avoid damage to the parting surfaces.
5. Remove any split bolts that may be holding the two bear­ing halves together. Remove the top half of the bearing sleeve using suitable eyebolts in the tapped holes pro­vided. Lift the bearing top straight up and avoid any con­tact with the shoulders of the shaft journals that might damage the thrust faces of the bearing. Place on a clean, dry surface, taking care to prevent damage to either the parting surfaces or the locating pins that are captive in the top bearing half.
6. Remove the 4 screws at the partings in the oil ring and dismantle the ring by gently tapping the dowel pin ends with a soft-faced mallet. Remove the ring halves and immediately reassemble them to avoid any mixup in parts or damage to the surfaces at the partings.
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7. When removing the labyrinth seals, note the position of the anti-rotation button located on the inside of the top half of the seal. Pull up the garter spring surrounding the floating labyrinth seal and carefully slip out the top half. Rotate the garter spring until the lock is visible. Twist counterclockwise to disengage the lock, remove the garter spring, then rotate the lower half of the seal out of the groove in the bearing housing while noting the orientation of the oil drain holes. Note the condition of these floating labyrinth seals. If they are cracked or chipped, they must be replaced. Do not attempt to reuse a damaged seal.
8. To remove the bottom bearing half, the shaft must be raised a slight amount to relieve pressure on the bear­ing. On the rear end, this can be done by jacking or lift­ing on the shaft extension. (Care must be taken to pro­tect the shaft from damage.) On the front end, jacking or lifting can be done using bolts threaded into the tapped holes provided in the shaft end.
NOTE: Lift only enough to free the bearing; over­lifting the shaft can cause difficulty in removing the bearing.
9. Roll the bottom bearing half to the top of the shaft jour­nal and then lift it using suitable eyebolts threaded into the holes provided. Again, avoid any contact with the shaft shoulders that could damage the bearing thrust faces. Place the lower bearing half on a clean, dry surface to protect the parting surfaces.
Use extreme care when rolling out the lower bear­ing half. Keep the hands and fingers well clear of any position where they might be caught by the bear­ing half if it were accidentally released and rotated back to its bottom position. Serious personal injury could result.
10. Protect the shaft journal by wrapping it with clean, heavy paper or cardboard.
Reassembly — Bearing reassembly is basically a reversal of the disassembly procedures outlined above, with the follow­ing additional steps.
Curil-T is the only approved compound for use in the assembly of the bearings on this motor. Other products may harden and impede the operation.
During the reassembly of the bearing parts, a thin layer of Curil-T should be applied to all gasketed and ma­chined interface surfaces. This suggestion does not ap­ply to the machined surfaces of the bearing liner halves.
1. The interior of the bearing housing should be cleaned and then flushed with clean oil or kerosene.
2. The bearing halves and the shaft journal should be wiped clean using lint-free cloth soaked with clean oil.
3. All parts should be carefully inspected for nicks, scratches, etc., in any contact surfaces. Such imperfections should be removed by an appropriate method such as stoning, scraping, filing, etc., followed by thorough cleaning.
4. Apply afew drops of oil to the journal and bearing saddles.
5. Roll the bottom half of the bearing into place and lower the shaft.
6. Before installing the floating labyrinth seal halves, ob­serve their condition. Do not attempt to use a cracked or chipped seal. The bottom half seal has a set of drilled holes in its side face. These must be placed at the bot­tom toward the inside of the bearing so that accumu­lating oil may drain back into the housing.
7. Put a small bead of Curil-T around the bottom seal half outside diameters on both sides adjacent to the garter spring groove. This prevents oil from bypassing the seal around its outside.
8. Place the bottom seal half on top of the shaft (ensuring that the proper orientation of the drain holes is pro­vided) and roll it into position. Install the top half of the seal making sure that the anti-rotation button is located in the proper position on the inboard side of the bearing. Insert the garter spring pulling up on both ends to per­mit engaging the lock. Run a small bead of Curil-Taround the outside diameters on both sides adjacent to the gar­ter spring groove on this half also.
9. Carefully reassemble the two oil ring halves. Inspect the dowel pins for burrs and straightness and make any cor­rections required. Do not force the ring halves together. Excessive force may alter the roundness or flatness of the ring which can change its oil delivery performance. Apply locking compound to the oil ring screws prior to reassembly.
10. Assemble the top half of the bearing liner making sure that the match marks on the liner halves align with one another.Failure to ensure alignment of match marks can cause misalignment and possible damage to bearings and journal surfaces. Reinstall any split bolts, if supplied, between the bearing halves.
11. Some of the pipe plugs in the housing are metric thread type and have a copper, lead, or similar material washer. If these plugs are removed, be careful not to lose the washers. Before reassembly, inspect the washers and re­place them if required.
12. Before installing the bearing cap, observe the position of the floating labyrinth seal. The ‘‘tab’’ must be on top to engage the pocket. Failure to position the seal prop­erly will result in damage when the cap is assembled.
13. Carefully lower the bearing housing cap over the float­ing seals. Keep the bearing cap level to avoid binding and possibly damaging the seals. The bearing cap should seat evenly on the bearing housing base.
When seating the bearing shell, apply a thin layer of lubricating oil at the spherical surface of the liner. Slowly roll the lower bearing liner into the bearing housing mak­ing sure that the split surfaces of the liner and the hous­ing are flush. Gradually lower the shaft onto the bear­ing. The weight of the shaft will help rotate the bearing liner so that the babbitt surface of the liner will match the slope of the journal. Sometimes it is necessary to use a rubber mallet to tap lightly on the bearing housing while slowly rolling the shaft to help this seating operation.
Do not force the bearing cap down. Damage could occur to the labyrinth seals.
If the bearing cap does not seat completely, remove and reset the floating labyrinth seal position. When install­ing upper bearing cap, the floating labyrinth seals some­times rotate and the anti-rotation ‘‘tab’’ does not seat in its holder, thus preventing the bearing housing from seat­ing properly. This procedure should be repeated until the bearing cap seats properly.
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14. Reinstall the bearing housing split bolts. Before torqu­ing bearing housing cap bolts, rotate the shaft by hand while bumping the bearing housing with a rubber or raw­hide mallet in the horizontal and axial planes to allow the bearings to align themselves to the shaft journals.
15. Torque the bearing housing cap bolts by following the torque values as provided in Table 6 on page 51.
Motor Handling/Rigging — Each motor is provided
with lifting lugs, welded to the four corners of the motor frame, for lifting the assembled chiller. The motor should always be lifted by using the lifting lugs located on all four corners of the motor frame. (See Fig. 46.)
Spreader bars of adequate capacity and number must be used to avoid applying any pressure against the top air housing with the lifting plugs.
provide proper protection while the motor is being stored. The motor should be stored under cover in a clean, dry lo­cation and should be protected from rapid temperature changes.
Since moisture can be very detrimental to electrical com­ponents, the motor temperature should be maintained at ap­proximately 5° F (3° C) above the dew point temperature by providing either external or internal heat. If the motor is equipped with space heaters, they should be energized at the voltage shown by the space heater nameplate attached to the motor.Incandescent light bulbs can be placed within the mo­tor to provide heat. However, if used, they must not be al­lowed to come in contact with any parts of the motor because of the concentrated hot spot that could result.
This motor has been provided with a shaft shipping brace or shipping bolt (normally painted yellow) to prevent shaft movement during transit, it must be removed to allow shaft rotation (refer to Before Initial Start-Up, Remove Shipping Packaging section, page 45). It is very important that this brace be reinstalled exactly as it was originally, before the motor is moved from storage or any time when the motor is being transported. This prevents axial rotor movement that might damage the bearings.
Motors equipped with sleeve bearings are shipped from the factory with the bearing oil reservoirs drained. In stor­age, the oil reservoirs should be properly filled to the center of the oil level gage with a good grade of rust inhibiting oil (refer to the certified drawing for oil viscosity and any spe­cial requirements). To keep the bearing journals well oiled and to prevent rusting, the motor shaft should be rotated sev­eral revolutions every 2 weeks. While the shaft is rotating it should be pushed to both extremes of the endplay to allow for oil flow over the entire length of the journals.
Fig. 46 — Motor Riggings
If the motor is lifted with the top air housing removed, the angle of the lifting slings with the horizontal should never be less than 45 degrees.
Withthe exclusion of the TEWACcooler, the top air hous­ing is provided with
3
⁄4-10 tapped holes for lifting devices to be installed in order to remove the air housing from the mo­tor. The top air housing can be detached by removing the enclosure holddown bolts, located in the inside corners of the enclosure. These enclosure holddown bolts are accessed through the louver/screens located on the front and rear end of the chiller or through access panels bolted to the sides of the enclosure.
Uneven lifting must always be avoided. When single point lifting is to be used, slings of equal lengths must always be used to avoid uneven lifting.
Under no circumstances should the motor be lifted us­ing the shaft as an attachment point.
NOTE: Refer to weights specified on certified drawing to determine proper lifting equipment required for specific com­ponents or assemblies.
Motor Storage — If the chiller is to be placed in ex-
tended shutdown, certain precautions must be taken to
External Gear Storage — All internal and unpainted
external surfaces of the gear drives have been treated with a rust preventative at the factory before shipment. The pro­tective life of the rust preventative varies with temperature fluctuations, atmospheric moisture content, degree of expo­sure to the elements during storage, and degree of contact with other objects.
Inspect all machined surfaces, and spray or add rust in­hibitor to exposed metal surfaces that may have had the pro­tective coating removed during shipping and handling.
T obe sure that the gear drive operates satisfactorily at start­up, take certain precautions when you receive it. The ex­pected length of storage and the storage atmosphere dictate the maintenance schedule to be followed. The gear must al­ways be stored in its operating position, level on its mount­ing feet, and free of loads or weights on input and output shafts.
SHORT-TERM STORAGE (Indoors) — If the units are to be stored for 30 days or less, observe the following precau­tions.
• Store the unit in a clean, dry location with the factory pack-
ing intact and with as nearly a constant temperature as possible.
• Elevate the unit a minimum of 6 in. above the floor level.
• Avoid areas that are subject to extremes in temperature,
vibration, and humidity.
LONG-TERM STORAGE (Indoors) — If the unit is to be stored for more than 30 days, observe the following precau­tions. Store in a clean, dry location. Elevate the unit at a minimum of 6 in. above the ground floor level. Avoid areas that are subject to extremes in temperature, vibration, and humidity. In addition, do one of the following:
• Remove the breather and replace it with pipe plugs. Pack
the entire seal area with grease to form a vapor barrier and seal with tape.
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Fill the gear drive to the recommended oil level with heated Shell VSI grade 68 oil or its equivalent, heated between 110 and 120 F (43 and 49 C). Do not overfill. Immediately close the openings to keep the vapors in the housing.
Inspect the unit every 30 days and spray or add rust in­hibitor suitable for anticipated storage conditions, as required.
Drain and replace the oil with the recommended oil type prior to start-up.
• Remove the breather and replace it with a pipe plug. Pack the entire seal area with grease to form a vapor barrier and seal it with tape. A vapor-phase rust inhibitor, such as Daubert Chemical, Non-Rust Motorstor VCi-10 or its equivalent, may be added to the recommended oil type in the amount of 2% of the total sump capacity. Fill the unit to the recommended level. Do not overfill.
Inspect the unit every 30 days and spray or add rust in­hibitor suitable for anticipated storage conditions, as required.
The unit may run without changing this oil mixture.
EXTENDED DOWNTIME — Consider the length of down­time the unit will undergo. The lubricating oil used in the unit should protect the interior parts for up to 30 days of shutdown. If the unit will be shut down longer than 30 days, it must be operated a minimum of 30 minutes every 30 days to distribute the lubricant to all interior parts.
If it is impractical to operate the unit every 30 days, the long-term storage instructions described above must be fol­lowed. All seals applied for this storage condition must be removed before operating the unit.
Compressor Bearing Maintenance — The key to
good bearing maintenance is proper lubrication. Use the proper grade of oil, maintained at recommended level, temperature, and pressure. Inspect the lubrication system regularly and thoroughly.
Only a trained service technician should remove and examine the bearings. The bearings should be examined on a scheduled basis for signs of wear. The frequency of ex­amination is determined by the hours of chiller operation, load conditions during operation, and the condition of the oil and the lubrication system. Excessive bearing wear can sometimes be detected through increased vibration or in­creased bearing temperature. If either symptom appears, con­tact an experienced and responsible service organization for assistance.
External Gear Maintenance — Perform the re-
quired maintenance and recommended intervals. Good pre­ventive maintenance prolongs the life of the unit.
Daily
• Inspect for leaks and loose connections.
• Check the oil level.
• Check the oil temperature and pressure.
• Check for unusual noise and/or vibration. Weekly — Check the oil filter.
Monthly
• Obtain oil sample analysis.
• Clean or replace oil filters.
• Check the foundation mounting bolts for tightness.
• Clean the air filter.
• Check the operation of all auxiliary equipment. Semi-Annually
• Check gear tooth wear.
• Check the oil and replace it if necessary.
• Check the coupling alignment.
Annually
• Check the heat exchanger for corrosion and clogged tubes.
• Check the bearing clearance and end play. Disassembly andAssembly Instructions — The following in-
structions apply to standard high speed gear units.
• Required Equipment: In addition to standard mechanic’s tools, have the following equipment on hand: hoist, sling, torque wrench, feeler gages, and dial indicator.
• General Instructions: Clean external surfaces of the gear unit before removing the cover to prevent contaminants from falling into it. Record the mounting dimensions and the location of accessories for reference when reassem­bling. To remove the gear from its operating area, discon­nect all connected equipment and lift the gear from its foundation using 4 lifting lugs.
Inspect the Heat Exchanger Tubes
COOLER — Inspect and clean the cooler tubes at the end of the first operating season. Because these tubes have internal ridges, a rotary-type tube cleaning system is necessary to fully clean the tubes. Upon inspection, the tube condition deter­mines the scheduled frequency for cleaning and indicates whether water treatment is adequate in the chilled water/ brine circuit. Inspect the entering and leaving chilled water temperature sensors for signs of slime, corrosion, or scale. Replace the sensor if corroded or remove any scale if found.
CONDENSER — Since this water circuit is usually an open­type system, the tubes may be subject to contamination and scale. Clean the condenser tubes with a rotary tube cleaning system at least once per year and more often if the water is contaminated. Inspect the entering and leaving condenser wa­ter sensors for signs of slime, corrosion, or scale. Replace the sensor if corroded or remove any scale if found.
Higher than normal condenser pressures, together with the inability to reach full refrigeration load, usually indicate dirty tubes or air in the chiller. If the refrigeration log indicates a rise above normal condenser pressures, check the condenser refrigerant temperature against the leaving condenser water temperature. If this reading is more than what the design dif­ference is supposed to be, then the condenser tubes may be dirty, or water flow may be incorrect. Because HFC 134a is a high-pressure refrigerant, air usually does not enter the chiller; rather, the refrigerant leaks out.
During the tube cleaning process, use brushes especially designed to avoid scraping and scratching the tube wall. Con­tact your Carrier representative to obtain these brushes. Do
not use wire brushes.
Hard scale may require chemical treatment for its pre­vention or removal. Consult a water treatment specialist for proper treatment.
WaterLeaks— Waterin the refrigerant is indicated dur-
ing chiller operation by the refrigerant moisture indicator on the refrigerant motor cooling line. Water leaks should be re­paired immediately.
The chiller must be dehydrated after repair of water leaks. See Chiller Dehydration section, page 49.
WaterTreatment— Untreated or improperly treated wa-
ter may result in corrosion, scaling, erosion, or algae. The services of a qualified water treatment specialist should be obtained to develop and monitor a treatment program.
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Water must be within design flow limits, clean, and treated to ensure proper chiller performance and reduce the po­tential of tube damage due to corrosion, scaling, ero­sion, and algae. Carrier assumes no responsibility for chiller damage resulting from untreated or improperly treated water.
Inspect the Starting Equipment — Before work-
ing on any starter, shut off the chiller, and open all discon­nects supplying power to the starter.
The disconnect on the starter front panel does not de­energize all internal circuits. Open all internal and re­mote disconnects before servicing the starter.
Never open isolating knife switches while equipment is operating. Electrical arcing can cause serious injury.
Inspect the starter contact surfaces for wear or pitting on mechanical-type starters. Do not sandpaper or file silver­plated contacts. Follow the starter manufacturer’s instruc­tions for contact replacement, lubrication, spare parts ordering, and other maintenance requirements.
Periodically vacuum or blow off accumulated debris on the internal parts with a high-velocity, low-pressure blower.
Power connections on newly installed starters may relax and loosen after a month of operation. Turn power off and retighten. Recheck annually thereafter.
Loose power connections can cause voltage spikes, over­heating, malfunctioning, or failures.
Check Pressure Transducers — Prior to start-up
and once a year, the pressure transducers should be checked against a pressure gage reading. Check all three transducers: oil pressure, condenser pressure, and cooler pressure.
Note the evaporator and condenser pressure readings on the STATUS01 screen on the LID. Attach an accurate set of refrigeration gages to the cooler and condenser Schrader fit­tings. Compare the two readings. If there is a difference in readings, the transducer can be calibrated, as described in the Troubleshooting Guide section.
Pumpout System Maintenance — For compres-
sor maintenance details, refer to the 06D, 07D Installation, Start-Up, and Service Instructions.
OPTIONALPUMPOUTCOMPRESSOR OIL CHARGE — Use oil conforming to Carrier specifications for reciprocat­ing compressor usage. See Table 11.
Oil should be visible in the compressor sight glass both during operation and at shutdown. Always check the oil level before operating the compressor.Before adding or chang­ing oil, relieve the refrigerant pressure as follows:
1. Attach a pressure gage to the gage port of either com-
pressor service valve (Fig. 34).
2. Close the suction service valve and open the discharge
line to the storage tank or the chiller.
3. Operate the compressor until the crankcase pressure drops
to 2 psig (13 kPa).
4. Stop the compressor and isolate the system by closing the discharge service valve.
5. Slowly remove the oil return line connection. Add oil as required.
6. Replace the connection and reopen the compressor serv­ice valves.
PUMPOUT SAFETY CONTROL SETTINGS (Fig. 47) — The pumpout system high-pressure switch should open at 161 psig (1110 kPa) and close at 130 psig (896 kPa). Check the switch setting by operating the pumpout compressor and slowly throttling the pumpout condenser water.
Fig. 47 — Controls for Optional Pumpout
Compressor
Ordering Replacement Chiller Parts — When or-
dering Carrier specified parts, the following information must accompany an order:
• chiller model number and serial number
• name, quantity, and part number of the part required
• delivery address and method of shipment
MOTOR REPLACEMENT PARTS — Replacement or re­newal parts information for the motor and any auxiliary de­vices can be obtained from the nearest Westinghouse Motor Company sales office. A complete description of the needed part(s) is necessary, together with the complete motor name­plate reading for positive motor identification.
EXTERNAL GEAR REPLACEMENT PARTS — Replace­ment or renewal parts information for the external gear and any auxiliary devices can be obtained from the nearest Nut­tall or Lufkin sales office.Acomplete description of theneeded part(s) is necessary, together with the complete gear name­plate reading for positive identification.
TROUBLESHOOTING GUIDE
Overview —
erator and the technician troubleshoot a 17EX chiller.
• By using the LID display, the actual operating conditions
of the chiller can be viewed while the unit is running.
• The CONTROL ALGORITHM STATUS table includes
screens with information that can be used to diagnose prob­lems with chilled water temperature control, chilled water
The PIC has many features to help the op-
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temperature control overrides, hot gas bypass, surge al­gorithm status, and time schedule operation. Refer to Fig. 14 and Table 2, Examples 11-14.
• The control test feature checks for proper operation and tests the temperature sensors, pressure transducers, theguide vane actuator, oil pumps, water pumps, tower control, and other on/off outputs while the compressor is stopped. It also has the ability to lock off the compressor and turn on water pumps for pumpout operation. The LID display shows the required temperatures and pressures during these op­erations. Refer to Fig. 16 for the CONTROL TEST menu structure and to the Control Testsection, page 85, for more information on this feature.
• Other SERVICE menu tables can access configured items, such as chilled water resets, override set points, etc.
• If an operating fault is detected, an alarm message is gen­erated and displayed on the LID default screen. A more detailed message, along with a diagnostic message, is also stored in the ALARM HISTORY table in the PIC.
Checking the Display Messages — The first area
to check when troubleshooting the 17EX is the LID display. If the alarm light is flashing, check the primary and second­ary message lines on the LID default screen (Fig. 11). These messages indicate where the fault is occurring. The ALARM HISTORY table on the SERVICE menu also carries an alarm message to further expand on this alarm. For a complete list of alarm messages, see Table 12. If the alarm light starts to
flash while accessing a menu screen, depress the EXIT key to return to the default LID screen to read the failure
message. The compressor does not run while an alarm con­dition exists unless the alarm type is an unauthorized start or a failure to shut down.
soft-
Checking Temperature Sensors — All tempera-
ture sensors are thermistors. This means that the resistance of the sensor varies with temperature. All sensors have the same resistance characteristics. Determine sensor tempera­ture by measuring voltage drop if the controls are powered, or resistance if the controls are powered off. Compare the readings to the values listed in Table 14A or 14B.
RESISTANCE CHECK — Turn off the control power and disconnect the terminal plug of the sensor in question from the module. Witha digital ohmmeter,measure the sensor re­sistance between the receptacles designated by the wiring diagram. The resistance and corresponding temperature are listed in Table14A or 14B. Check the resistance of both wires to ground. This resistance should be infinite.
VOLTAGE DROP — Using a digital voltmeter, the voltage drop across any energized sensor can be measured while the control is energized. Table 14A or 14B lists the relationship between temperature and sensor voltage drop (volts dc mea­sured across the energized sensor). Exercise care when mea­suring voltage to prevent damage to the sensor leads, con­nector plugs, and modules. The sensor wire should also be checked at the sensor plug connection. Check the sensor wire by removing the condenser at the sensor and measure for 5 vdc back to the module, if the control is powered.
Relieve all refrigerant pressure or drain the water prior to replacing the temperature sensors.
CHECK SENSOR ACCURACY — Place the sensor in a medium of a known temperature and compare that tempera­ture to the measured reading. The thermometer used to de­termine the temperature of the medium should be of labo­ratory quality with 0.5° F (.25° C) graduations. The sensor in question should be accurate to within 2° F (1.2° C).
See Fig. 6 for sensor locations. The sensors are immersed directly in the refrigerant or water circuits. The wiring at each sensor is easily disconnected by unlatching the connector. These connectors allow only one-way connection to the sen­sor. When installing a new sensor, apply a pipe sealant or thread sealant to the sensor threads.
DUAL TEMPERATURE SENSORS — There are 2 sensing elements on each of the bearing temperature sensors for ser­vicing convenience. In case one of the dual sensors is dam­aged, the other one can be used by moving a wire.
The number 1 terminal in the sensor terminal box is the common line. To use the second sensor, move the wire from the number 2 position to the number 3 position.
CheckingPressureTransducers— The 17EX chiller
has 5 transducers. These transducers sense cooler pressure, condenser pressure, compressor oil supply pressure, oil sump, and gear oil supply pressure. The compressor oil supply pres­sure and the oil transmission sump pressure differenceis cal­culated by a differential pressure power supply module. The PSIO then reads this differential. In effect, then, the PSIO reads 3 pressure inputs. The cooler and condenser transducers are used by the PIC to determine refrigerant temperatures.
All pressure inputs can be calibrated, if necessary.It is not usually necessary to calibrate at initial start-up. However, at high altitude locations, calibration of the transducer will be necessary to ensure the proper refrigerant temperature/ pressure relationship. Each transducer is supplied with 5 vdc power from a power supply .If the power supply fails, a trans­ducer voltage reference alarm occurs. If the transducer read­ing is suspected of being faulty, check the supply voltage. It should be 5 vdc ± .5 v. If the supply voltage is correct, the transducer should be re-calibrated or replaced.
To calibrate oil pressure differential, refer to Oil Pressure Differential Calibration at the end of this section.
Calibration can be checked by comparing the pressure read­ings from the transducer against an accurate refrigeration gage. These readings are all viewed or calibrated from the STATUS01 screen on the LID. The transducer can be checked and calibrated at 2 pressure points. These calibration points are 0 psig (0 kPa) and between 240 and 260 psig (1655 to 1793 kPa). To calibrate these transducers:
1. Shut down the compressor.
2. Disconnect the transducer in question from its Schrader
fitting. NOTE: If the cooler or condenser vessels are at 0 psig
(0 kPa) or are open to atmospheric pressure, the trans­ducers can be calibrated for zero without removing the transducer from the vessel.
3. Access the STATUS01 screen, and view theparticular trans-
ducer reading; it should read 0 psi (0 kPa). If the reading is not 0 psi (0 kPa), but within ± 5 psi (35 kPa), the
value may be zeroed by pressing the SELECT while the parameter for the transducer is highlighted. Then, press the ENTER
to zero. If the transducer value is not within the calibration range,
the transducer returns to the original reading. If the LID pressure value is within the allowed range (noted above), check the voltage ratio of the transducer. To obtain the voltage ratio, divide the voltage (dc) input from the trans­ducer by the supply voltage signal, measured at the PSIO terminals J7-J34 and J7-J35. For example, the condenser transducer voltage input is measured at PSIO terminals J7-1 and J7-2. The voltage ratio must be between
0.80 vdc and 0.11 vdc for the software to allow calibra­tion. Pressurize the transducer until the ratio is within range. Then attempt calibration again.
softkey.The value will now go
softkey
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4. A high pressure point can also be calibrated between 240 and 260 psig (1655 and 1793 kPa) by attaching a regu­lated 250 psig (1724 kPa) pressure (usually from a ni­trogen cylinder). The high pressure point can be calibrated by accessing the appropriate transducer on the
STATUS01 screen, highlighting the transducer, pressing the SELECT
softkey, and then increasing or decreasing
the value to the exact pressure on the refrigerant gage. Press ENTER
to finish. High altitude locations must com­pensate the pressure so that the temperature/pressure re­lationship is correct.
If the transducer reading returns to the previous value and the pressure is within the allowed range, check the volt­age ratio of the transducer. Refer to Step 3 above. The voltage ratio for this high pressure calibration must be between 0.585 and 0.634 vdc to allow calibration. Change the pressure at the transducer until the ratio is within the acceptable range. Then attempt to calibrate to the new pressure input.
The PIC will not allow calibration if the transducer is too far out of calibration. A new transducer must be installed and re-calibrated.
OILDIFFERENTIALPRESSURE/POWER SUPPLYMOD­ULE CALIBRATION — (See Fig. 48.) The oil reservoir in the 17EX chiller is not common to cooler pressure. There­fore, a comparison of pump output to cooler pressure can not be used to provide differential oil pressure information. A different method has been developed.
Oil transmission sump pressure and oil supply pressure are fed to a comparator circuit on a 5V power supply board. The output of this circuit, which represents differential oil pressure, is fed to the PSIO. The oil differential pressure is calibrated to 0 psid (0 kPad) by selecting the oil pressure input on the STATUS01 screen. Then, with the oil pump turned
OFF and the transducers connected, press the ENTER key to zero the point. No high end calibration is needed or
possible.
soft-
17EX OIL PRESSURE INPUT
TROUBLESHOOTING TRANSDUCERS — When trouble­shooting transducers, keep the negative lead of your volt­ohmmeter on terminal U4 of the power supply (or terminal 4 on power supplies without the comparator circuit).
Voltage VO1 = (VH1-VL1) + .467 ± .1 V For all PIC transducers: Measured pressure = (507.97 × (V
V
= transducer output ref. to neg. terminal
out
(4 or U4) i.e., VH1 to U4 or VL1 to U4
out/Vin
)) − 47.33
Vin= power supply output, i.e., U3 to U4
TRANSDUCER REPLACEMENT — Since the transduc­ers are mounted on Schrader-type fittings, there is no need to remove refrigerant from the vessel. Disconnect the trans­ducer wiring by pulling up on the locking tab while pulling up on the weather-tight connecting plug from the end of the transducer. Do not pull on the transducer wires. Unscrew the transducer from the Schrader fitting. When installing a new transducer, do not use pipe sealer, which can plug the sensor. Put the plug connector back on the sensor and snap into place. Check for refrigerant leaks.
Make sure to use a backup wrench on the Schrader fit­ting whenever removing a transducer.
ControlAlgorithms Checkout Procedure — One
of the tables in the SERVICE menu is the CONTROL AL­GORITHM STATUS table. This table has 6 screens that may be viewed to see how a particular control algorithm is operating, that is, to see what parameters and values the PIC is using to control the chiller.
MAINT01 Capacity MAINT02 Override MAINT03 Surge/
MAINT04 LEAD/LAG OCCDEFM Time
WSMDEFME Water
Control Status HGBP
Status Status Schedules
Status
System Manager Status
These maintenance tables are very useful in determining guide vane position, reaction from load changes, control point overrides, hot gas bypass reaction, surge prevention, etc.
Thevalues used tocalculatethe chilled water/brine control point.
Detailsofall chilled water controlover­ride values
The surge and hot gas bypass control algorithm status as well as the values dealing with this control.
LEAD/LAG operation status. The Local and CCN occupied sched-
ules,displayedin a waythatallows the operator toquickly determine whether the schedule is in an occupied period or not.
The status of the WSM (water system manager),a CCN module thatcan turn on the chiller and change the chilled water control point.
Fig. 48 — Oil Differential Pressure/Power
Supply Module
Control Test — The control test feature can check all
the thermistor temperature sensors, including those on the Options modules, pressure transducers, pumps and their as­sociated flow switches, the guide vane actuator, and other control outputs, such as hot gas bypass. The tests can help to determine whether a switch is defective, or a pump relay is not operating, among other useful troubleshooting tests.
During pumpdown operations, the pumps are energized to prevent freeze-up, and the vessel pressures and tempera­tures are displayed. The pumpdown/lockout feature pre­vents the compressor from starting up when there is no re­frigerant in the chiller or when the vessels are isolated. The operator then uses the terminate lockout screen to end the pumpdown lockout after the pumpdown procedure is re­versed and refrigerant is added.
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LEGEND FOR TABLE 12, A - N
1CR AUX Compressor Start Contact CA P
Compressor Current CCN Carrier Comfort Network CDFL Condenser Water Flow CHIL S S
Chiller Start/Stop CHW Chilled Water CMPD Discharge Temperature CRP Condenser Pressure ERT Evaporator Refrigerant Temperature EVFL Chilled Water Flow GV TRG
Target Guide Vane Position LED Light-Emitting Diode LID Local Interface Device
OILPD Oil Pressure OILT Oil Sump Temperature PIC Product Integrated Control PRS TRIP
Pressure Trip Contact PSIO Processor Sensor Input/Output Module RLA Rated Load Amps RUN AUX
Compressor Run Contact SMM Starter Management Module SPR PL STR FLT
Spare Protective Limit Input
Starter Fault TXV Thermostatic Expansion Valve VP V REF
Line Voltage: Percent
Voltage Reference
MTRB Bearing Temperature MTRW Motor Winding Temperature
Table 12 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides
A. SHUTDOWN WITH ON/OFF/RESET-OFF
PRIMARY MESSAGE SECONDARY MESSAGE PROBABLE CAUSE/REMEDY
MANUALLY STOPPED — PRESS CCN OR LOCAL TO START TERMINATE PUMPDOWN MODE TO SELECT CCN OR LOCAL
SHUTDOWN IN PROGRESS COMPRESSOR UNLOADING Chiller unloading before shutdown due to soft/stop feature. SHUTDOWN IN PROGRESS COMPRESSOR DEENERGIZED ICE BUILD OPERATION COMPLETE Chiller shutdown from Ice Build operation.
PIC in OFF mode, press the CCN or local softkey to start unit.
Enter the CONTROL TEST table and select to unlock compressor.
Chillercompressor isbeing commandedto stop.Water pumpsare deen­ergized within one minute.
TERMINATE LOCKOUT
B. TIMING OUT OR TIMED OUT
PRIMARY MESSAGE SECONDARY MESSAGE PROBABLE CAUSE/REMEDY
READY TO START IN XX MIN UNOCCUPIED MODE READY TO START IN XX MIN REMOTE CONTACTS OPEN Remote contacts have stopped chiller. Close contacts to start. READY TO START IN XX MIN STOP COMMAND IN EFFECT READY TO START IN XX MIN RECYCLE RESTART PENDING Chiller in recycle mode.
READY TO START UNOCCUPIED MODE READY TO START REMOTE CONTACTS OPEN Remote contacts have stopped chiller. Close contacts to start.
READY TO START STOP COMMAND IN EFFECT READY TO START IN XX MIN REMOTE CONTACTS CLOSED Chiller timer counting down unit. Ready for start.
READY TO START IN XX MIN OCCUPIED MODE Chiller timer counting down unit. Ready for start. READY TO START REMOTE CONTACTS CLOSED Chiller timers complete, unit start will commence. READY TO START OCCUPIED MODE Chiller timers complete, unit start will commence. STARTUP INHIBITED LOADSHED IN EFFECT CCN loadshed module commanding chiller to stop.
READY TO START IN XX MIN START COMMAND IN EFFECT
Time schedule for PIC is unoccupied. Chillers will start only when occupied.
Chiller START/STOP on STATUS01 manually forced to stop. Re­lease value to start.
Time schedule for PIC is unoccupied. Chiller will start when occu­pied. Make sure the time and date have been set on the SERVICE menu.
Chiller START/STOP on STATUS01 manually forced to stop. Re­lease value to start.
Chiller START/STOP on STATUS01 has been manually forced to start. Chiller will start regardless of time schedule or remote contact status.
C. IN RECYCLE SHUTDOWN
PRIMARY MESSAGE SECONDARY MESSAGE PROBABLE CAUSE/REMEDY
RECYCLE RESTART PENDING OCCUPIED MODE RECYCLE RESTART PENDING REMOTE CONTACT CLOSED RECYCLE RESTART PENDING START COMMAND IN EFFECT RECYCLE RESTART PENDING ICE BUILD MODE
Unit in recycle mode, chilled water temperature is not high enough to start.
Unit in recycle mode, chilled water temperature is not high enough to start.
Chiller START/STOP on STATUS01 manually forced to start, chilled water temperature is not high enough to start.
Chiller in ICE BUILD mode. Chilled water/brine temperature is satis-
ICE BUILD SETPOINT
fied for
temperature.
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Table 12 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides (cont)
D. PRE-STARTALERTS: These alerts only delay start-up. When alert is corrected, the start-up will continue. No reset is necessary.
PRIMARY MESSAGE SECONDARY MESSAGE ALARM MESSAGE/PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY PRESTART ALERT STARTS LIMIT EXCEEDED STARTS EXCESSIVE Compressor Starts (8 in
PRESTART ALERT HIGH MOTOR TEMPERATURE MTRW [VALUE] exceeded limit of [LIMIT]*.
PRESTART ALERT HIGH BEARING TEMPERATURE MTRB [VALUE] exceeded limit of [LIMIT]*.
PRESTART ALERT HIGH DISCHARGE TEMP CMPD [VALUE] exceeded limit of [LIMIT]*. PRESTART ALERT LOW REFRIGERANT TEMP ERT [VALUE] exceeded limit of [LIMIT]*. Check PRESTART ALERT LOW OIL TEMPERATURE OILT [VALUE] exceeded limit of [LIMIT]*. PRESTART ALERT LOW LINE VOLTAGE V P [VALUE] exceeded limit of [LIMIT]*.
PRESTART ALERT HIGH LINE VOLTAGE V P [VALUE] exceeded limit of [LIMIT]*.
PRESTART ALERT HIGH CONDENSER PRESSURE CRP [VALUE] exceeded limit of [LIMIT]*. Check PRESTART ALERT HIGH GEAR OIL TEMP GEAOILT [VALUE] exceeded limit of [LIMIT].*
*[LIMIT] is shown on the LID as temperature, pressure, voltage, etc., set point predefined or selected by the operator as an override, alert, or alarm condition. [VALUE]
is the actual pressure, temperature, voltage, etc., at which the control tripped.
12 hours) Check motor temperature.
Check thrust bearing temperature.
Check discharge temperature. refrigerant temperature. Check oil temperature. Check voltage supply.
Check voltage supply.
condenser water and transducer. Check gear oil cooler flow.
E. NORMAL OR AUTO.-RESTART
Depress the RESET softkey if additionalstart is required. Reassess start-up requirements.
Check motor cooling line for proper operation. Check for excessive starts within a short time span.
Check oil heater for properoperation, check for low oil level, partially closed oil supply valves, etc. Check sensor accuracy.
Check sensor accuracy. Allow discharge tem­perature to cool. Check for excessive starts.
Checktransducer accuracy.Checkfor low chilled water/brine supply temperature.
Check oil heater power, oil heater relay. Check oil level.
Checkvoltage supply.Check voltage transform­ers. Consult power utility if voltage is low.Cali­brate voltage reading on STATUS01 Table.
Checkvoltage supply.Check voltage transform­ers. Consult power utility if voltage is low.Cali­brate voltage reading on STATUS01 table.
Check for high condenser water temperature. Check transducer accuracy.
Check for cooler water flow. Check sensor for accuracy.
PRIMARY MESSAGE SECONDARY MESSAGE PROBABLE CAUSE/REMEDY
STARTUP IN PROGRESS OCCUPIED MODE Chiller starting. Time schedule is occupied. STARTUP IN PROGRESS REMOTE CONTACT CLOSED Chiller starting. Remote contacts are closed.
STARTUP IN PROGRESS START COMMAND IN EFFECT AUTORESTART IN PROGRESS OCCUPIED MODE Chiller starting. Time schedule is occupied.
AUTORESTART IN PROGRESS REMOTE CONTACT CLOSED Chiller starting. Remote contacts are closed. AUTORESTART IN PROGRESS START COMMAND IN EFFECT
Chiller starting. Chiller START/STOP on STATUS01 manually forced to start.
Chiller starting. Chiller START/STOP on STATUS01 manually forced to start.
F. SPARE SENSOR ALERT MESSAGES
PRIMARY MESSAGE SECONDARY MESSAGE ALARM MESSAGE/PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY
SPARE SENSOR ALERT COMMON CHWS SENSOR Sensor Fault: Check commonCHWS sensor. SPARE SENSOR ALERT COMMON CHWR SENSOR Sensor Fault: Check common CHWR
SPARE SENSOR ALERT REMOTE RESET SENSOR Sensor Fault: Check remote reset tempera- SPARE SENSOR ALERT TEMP SENSOR — SPARE 1 Sensor Fault: Check temperature sensor — SPARE SENSOR ALERT TEMP SENSOR — SPARE 2 Sensor Fault: Check temperature sensor — SPARE SENSOR ALERT TEMP SENSOR — SPARE 3 Sensor Fault: Check temperature sensor — SPARE SENSOR ALERT TEMP SENSOR — SPARE 4 Sensor Fault: Check temperature sensor — SPARE SENSOR ALERT TEMP SENSOR — SPARE 5 Sensor Fault: Check temperature sensor — SPARE SENSOR ALERT TEMP SENSOR — SPARE 6 Sensor Fault: Check temperature sensor — SPARE SENSOR ALERT TEMP SENSOR — SPARE 7 Sensor Fault: Check temperature sensor — SPARE SENSOR ALERT TEMP SENSOR — SPARE 8 Sensor Fault: Check temperature sensor — SPARE SENSOR ALERT TEMP SENSOR — SPARE 9 Sensor Fault: Check temperature sensor —
sensor. ture sensor. Spare 1. Spare 2. Spare 3. Spare 4. Spare 5. Spare 6. Spare 7. Spare 8. Spare 9.
Check alert temperature set points on EQUIP­MENT SERVICE table, SERVICE2 screen. Check sensor for accuracy if reading is not accurate.
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Table 12 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides (cont)
G. START-UP FAILURES: This is an alarm condition. A manual reset is required to clear.
PRIMARY MESSAGE SECONDARY MESSAGE ALARM MESSAGE/PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY FAILURE TO START LOW OIL PRESSURE OILPD [VALUE] exceeded limit of [LIMIT]*. Check
FAILURE TO START OIL PRESS SENSOR FAULT OILPD [VALUE] exceeded limit of [LIMIT]*. Check
FAILURE TO START LOW CHILLED WATER FLOW EVFL Evap Flow Fault: Check water pump/flow FAILURE TO START LOW CONDENSER FAILURE TO START STARTER FAULT STR FLT Starter Fault: Check Starter for Fault FAILURE TO START STARTER OVERLOAD TRIP STR FLT Starter Overload Trip: Check amps FAILURE TO START LINE VOLTAGE DROPOUT V P Single-Cycle Dropout Detected: Check volt-
FAILURE TO START HIGH CONDENSER
FAILURE TO START EXCESS ACCELERATION
FAILURE TO START STARTER TRANSITION FAILURE TO START 1CR AUX CONTACT FAULT 1CR AUX Starter Contact Fault: Check 1CR/1M FAILURE TO START MOTOR AMPS NOT SENSED CA PMotor Amps Not Sensed:Check motor load
FAILURE TO START CHECK REFRIGERANT TYPE Current Refrigerant PropertiesAbnormal — Check
FAILURE TO START LOW OIL PRESSURE LowOilPressure [LIMIT]:*Check oilpressure switch/
FAILURE TO START LOW GEAR OIL PRESSURE GEAROILP [VALUE] exceeded limit of [LIMIT].* FAILURE TO START GEAR OIL PRESSURE SENSOR Gear OilPressureTransducer Out ofRange [VALUE]. Check calibration of transducer. Replace if
*[LIMIT] is shown on the LID as the temperature, pressure, voltage, etc., set pointpredefined or selectedby the operatoras an override,alert, or alarmcondition. [VALUE]
is the actual pressure, temperature, voltage, etc., at which the control tripped.
WATER FLOW
PRESSURE
TIME
FAULT
oil pump system.
oil pressure sensor.
switch. CDFL Cond. Flow Fault: Check water pump/flow
switch. Source. calibration/reset overload. age supply.
High Condenser Pressure [LIMIT]:* Check switch 2C aux, and water temperature/flow.
CA P ExcessAcceleration:Check guidevane clo­sure at start-up.
RUN AUX Starter Transition Fault: Check 1CR/ 1M/Interlock mechanism.
aux. contacts. signal.
Selection of refrigerant type.
pump and 2C aux.
Check gear oil pump/filter.
Check for closed oil supply valves. Check oil filter. Check for low oil temperature. Check transducer accuracy.
Check for excessive refrigerant in oil sump. Run oil pump manually for 5 minutes. Check calibration of oilpressure differentialamplifier modules.Check wir­ing. Replace transducers if necessary.
Check wiring to flow switch. Check through CON­TROL TEST for proper switch operation.
Check wiring to flow switch. Check through CON­TROL TEST for proper switch operation.
Astarter protective device has faulted. Check starter for ground fault, voltage trip, temperature trip, etc.
Reset overloads, check ICR relay before restarting chiller.
Check voltage supply.Check transformers for sup­ply.Checkwith utilityif voltagesupply is erratic. Moni­tor must be installed to confirm consistent, single­cycle dropouts. Check low oil pressure switch.
Check for proper design condenser flow and tem­perature.Check condenserapproach. Check 2Caux­iliary contactson oil sump starter. Check high pres­sure switch.
Checkthat guidevanes areclosed atstart-up. Check starter for proper operation. Reduce unit pressure if possible.
Check starter for proper operation. Run contact failed to close.
Check starter for proper operation. Start contact failed to close.
Checkfor proper motor amps signal to SMM.Check wiringfrom SMMto current transformer. Check main motor circuit breaker for trip.
Pressures at transducers indicate another refriger­ant type in control test. Makesure toaccess the AT­TACHTO NETWORK DEVICE screen after speci­fying HFC-134a refrigerant type.
The oil pressure differential switch is open when the compressortried tostart. Checkthe switchfor proper operation.Also,check theoil pumpinterlock (2Caux) in the power panel and the high condenser pres­sure switch.
Check for closed oil supply valves. Check oil filter. Check transducer accuracy.
necessary.
H. COMPRESSOR JUMPSTARTAND REFRIGERANT PROTECTION
PRIMARY MESSAGE SECONDARY MESSAGE ALARM MESSAGE/PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY
UNAUTHORIZED OPERATION
POTENTIAL FREEZE-UP EVAP PRESS/TEMP
FAILURE TO STOP DISCONNECT POWER RUN AUX Emergency: DISCONNECT
LOSS OF COMMUNICATION
STARTER CONTACT FAULT
POTENTIAL FREEZE UP COND PRESS/TEMP
*[LIMIT] is shown on the LID as the temperature, pressure, voltage, etc., set pointpredefined or selectedby the operatoras an override,alert, or alarmcondition. [VALUE]
is the actual pressure, temperature, voltage, etc., at which the control tripped.
UNIT SHOULD BE STOPPED
TOO LOW
WITH STARTER Loss of Communication with Starter: Check ABNORMAL 1CR OR
RUN AUX TOO LOW
CA P Emergency: Compressor running without control authorization.
ERT Emergency: Freeze-up prevention.
POWER.
chiller. 1CR AUX Starter Contact Fault: Check
1CR/1M aux. contacts. CRT [VALUE] exceeded limit of [LIMIT]*
Emergency: Freeze-up prevention.
Compressor is running with more than 10% RLA and control is trying to shut it down. Turn power offto compressorif unable tostop. Determinecause before re-powering.
Determine cause. If pumping refrigerant out of chiller, stop operation and go over pumpout procedures.
Starter run and startcontacts are energized while control tried to shut down. Disconnect power to starter.
Checkwiring fromPSIO to SMM.Check SMMmod­ule troubleshooting procedures.
Starterrun andstart contacts energizedwhile chiller was off. Disconnect power.
The condenser pressure transducer is reading a pressure that could freeze the water in the con­densertubes. Checkforcondenser refrigerantleaks, bad transducers,or transferred refrigerant. Place the unit in PUMPDOWN mode to eliminate the alarm if vessel is evacuated.
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Table 12 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides (cont)
I. NORMAL RUN WITH RESET, TEMPERATURE, OR DEMAND
PRIMARY MESSAGE SECONDARY MESSAGE PROBABLE CAUSE/REMEDY
RUNNING — RESET ACTIVE 4-20MA SIGNAL
RUNNING — RESET ACTIVE CHW TEMP DIFFERENCE RUNNING — TEMP CONTROL LEAVING CHILLED WATER Default method of temperature control. RUNNING — TEMP CONTROL ENTERING CHILLED WATER ECW control activated on CONFIG screen. RUNNING — TEMP CONTROL TEMPERATURE RAMP LOADING Ramp loading in effect. Use SERVICE1 screen to modify. RUNNING — DEMAND LIMITED BY DEMAND RAMP LOADING Ramp loading in effect. Use SERVICE1 screen to modify. RUNNING — DEMAND LIMITED BY LOCAL DEMAND SETPOINT Demand limit set point is , actual demand. RUNNING — DEMAND LIMITED BY 4-20MA SIGNAL
RUNNING — DEMAND LIMITED BY LOADSHED/REDLINE RUNNING — TEMP CONTROL HOT GAS BYPASS RUNNING — DEMAND LIMITED BY LOCAL SIGNAL Active demand limit manually overridden on STATUS01 table.
RUNNING — TEMP CONTROL ICE BUILD MODE Chiller is running under Ice Build temperature control.
J. NORMAL RUN OVERRIDES ACTIVE (ALERTS)
PRIMARY MESSAGE SECONDARY MESSAGE ALARM MESSAGE/PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY
RUN CAPACITY LIMITED HIGH CONDENSER PRESSURE CRP [VALUE] exceeded limit of [LIMIT]*. RUN CAPACITY LIMITED HIGH MOTOR TEMPERATURE MTRW [VALUE] exceeded limit of [LIMIT]*. RUN CAPACITY LIMITED LOW EVAP REFRIG TEMP ERT[VALUE]exceeded limit of [LIMIT]*. Check RUN CAPACITY LIMITED HIGH COMPRESSOR LIFT Surge Prevention Override; lift too high for RUN CAPACITY LIMITED MANUAL GUIDE VANE TARGET GV TRGRun Capacity Limited: Manual guide
*[LIMIT] is shown on the LID as the temperature, pressure, voltage, etc., set pointpredefined or selectedby the operatoras an override,alert, or alarmcondition. [VALUE]
is the actual temperature, pressure, voltage, etc., at which the control tripped.
Condenser pressure override. Motor temperature override. refrigerant charge level. compressor. vane target.
Reset program active based on CONFIG screen setup.RUNNING — RESET ACTIVE REMOTE SENSOR CONTROL
Demand limit is active based on CONFIG screen setup.RUNNING — DEMAND LIMITED BY CCN SIGNAL
Hot gas bypass option is energized. See surge prevention in the control section.
See Capacity Overrides, Table 4. Correct operating condition, modify set­point, or release override.
K. OUT-OF-RANGE SENSOR FAILURES
PRIMARY MESSAGE SECONDARY MESSAGE ALARM MESSAGE/PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY SENSOR FAULT LEAVING CHW TEMPERATURE Sensor Fault: Check leaving CHW
SENSOR FAULT ENTERING CHW TEMPERATURE Sensor Fault: Check entering CHW SENSOR FAULT CONDENSER PRESSURE Sensor Fault: Check condenser pressure SENSOR FAULT EVAPORATOR PRESSURE Sensor Fault: Check evaporator pressure SENSOR FAULT BEARING TEMPERATURE Sensor Fault: Check bearing temperature SENSOR FAULT MOTOR WINDING TEMP Sensor Fault: Check motor temperature SENSOR FAULT DISCHARGE TEMPERATURE Sensor Fault: Check discharge temperature SENSOR FAULT OIL SUMP TEMPERATURE Sensor Fault: Check oil sump temperature SENSOR FAULT OIL PRESSURE TRANSDUCER Sensor Fault: Check oil pressure
sensor. sensor. transducer. transducer. sensor. sensor. sensor. sensor. transducer.
See sensor test procedure and check sensors for proper operation and wiring.
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Table 12 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides (cont)
L. CHILLER PROTECT LIMIT FAULTS
Excessive numbers of the same fault can lead to severe chiller damage. Seek service expertise.
PRIMARY MESSAGE SECONDARY MESSAGE ALARM MESSAGE/PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY PROTECTIVE LIMIT HIGH DISCHARGE TEMP CMPD [VALUE] exceeded limit of [LIMIT]*.
PROTECTIVE LIMIT LOW REFRIGERANT TEMP ERT [VALUE] exceeded limit of [LIMIT]*.
PROTECTIVE LIMIT HIGH MOTOR TEMPERATURE MTRW [VALUE]exceeded limit of [LIMIT]*.
PROTECTIVE LIMIT HIGH BEARING TEMPERATURE MTRB [VALUE] exceeded limit of [LIMIT]*.
PROTECTIVE LIMIT LOW OIL PRESSURE OILPD [VALUE] exceeded limit of [LIMIT]*.
PROTECTIVE LIMIT NO MOTOR CURRENT CA P Loss of Motor Current: Check
PROTECTIVE LIMIT POWER LOSS V P Power Loss: Check voltage PROTECTIVE LIMIT LOW LINE VOLTAGE V P [VALUE] exceeded limit of [LIMIT]*. PROTECTIVE LIMIT HIGH LINE VOLTAGE V P [VALUE] exceeded limit of [LIMIT]*. PROTECTIVE LIMIT LOW CHILLED WATER FLOW EVFL Flow Fault: Check evap pump/flow PROTECTIVE LIMIT LOW CONDENSER WATER FLOW CDFL Flow Fault: Check condenser pump/ PROTECTIVE LIMIT HIGH CONDENSER PRESSURE High CondPressure [OPEN]*:Check switch,
PROTECTIVE LIMIT HIGH CONDENSER PRESSURE HighCond Pressure [VALUE]*:Checkswitch,
PROTECTIVE LIMIT 1CR AUX CONTACT FAULT CR AUX Starter Contact Fault: Check PROTECTIVE LIMIT RUN AUX CONTACT FAULT RUN AUX Starter Contact Fault: Check PROTECTIVE LIMIT CCN OVERRIDE STOP CHIL S S CCN Override Stop while in
PROTECTIVE LIMIT SPARE SAFETY DEVICE SRP PL Spare Safety Fault: Check PROTECTIVE LIMIT EXCESSIVE MOTOR AMPS CA P [VALUE]exceeded limit of [LIMIT]*. PROTECTIVE LIMIT EXCESSIVE COMPR SURGE Compressor Surge: Check condenser wa- PROTECTIVE LIMIT STARTER FAULT STR FLT Starter Fault: Check starter for
PROTECTIVE LIMIT STARTER OVERLOAD TRIP STR FLT Starter Overload Trip: Check
*[LIMIT] is shown on the LID as the temperature, pressure, voltage, etc., set point predefined or selected by the
operator as an override, alert, or alarm condition. [VALUE] is the actual temperature, pressure, voltage, etc., at which the control tripped. [OPEN] indicates that an input circuit is open.
Check discharge temperature.
Check evap pump and flow switch.
Check motor cooling and solenoid.
Check oil cooling control.
Check oil pump and transducer.
Low Oil Pressure [OPEN]*. Check oil pressure switch/pump and 2C aux.
sensor.
supply. Check voltage supply. Check voltage supply. switch. flow switch. oil pressure contact, and water temp/flow.
HighCond Pressure[VALUE]*:Checkswitch, water flow, and transducer.
water flow, and transducer.
1CR/1M aux contacts. 1CR/1M aux contacts. LOCAL run mode.
contacts. High Amps; Check guide vane drive. ter temp and flow.
fault source.
amps calibration/reset overload.
Checkdischarge temperatureimmediately.Check sen­sor for accuracy; check for propercondenser flowand temperature; check oil reservoir temperature. Check condenser for fouled tubes or air in chiller. Check for proper guide vane actuator operation.
Check for proper amount of refrigerant charge; check for proper water flow and temperatures. Check for proper guide vane actuator operation.
Check motor temperature immediately. Check sen­sorfor accuracy.Checkfor proper condenser flow and temperature. Check motor cooling system for restric­tions. Check motor coolingsolenoid for proper opera­tion. Check refrigerant filter.
Check for throttled oil supply isolation valves. Valves should be wide open. Check oil cooler thermal ex­pansion valve. Check sensor accuracy. Check jour­naland thrust bearings. Check refrigerant filter.Check for excessive oil sump level.
Check powerto oil pump and oil level. Check for dirty filtersor oilfoaming atstart-up. Checkfor thermalover­load cutout. Reduce ramp load rate if foaming noted. NOTE: This alarm is not related to pressure switch problems.
Check the oil pressure switch for proper operation. Check oil pump for proper pressure. Check for ex­cessive refrigerant in oil system.
Checkwiring: Checktorque setting onsolid-state starter. Check for main circuit breaker trip. Check power sup­ply to PSIO module.
Check 24-vac input on the SMM (terminals 23 and
24).Check transformersto SMM. Check power toPSIO module. Check distribution bus. Consult power company.
Perform pumps control test (from CONTROL TEST table) and verify proper switch operation. Check all water valves and pump operation.
Checkthe high-pressureswitch. Checkfor propercon­denser pressures and condenser water flow. Check for fouled tubes. Check the 2C aux. contact and the oil pressure switch in the power panel. This alarm is not caused by the transducer.
Checkwater flowin condenser.Checkfor fouledtubes. Transducershould be checkedfor accuracy.Thisalarm is not caused by the high pressure switch.
Checkwater flowin condenser.Checkfor fouledtubes. Transducershould be checkedfor accuracy.Thisalarm is not caused by the high pressure switch.
1CR auxiliary contact opened while chiller was run­ning. Check starter for proper operation.
Run auxiliary contact opened while chiller was run­ning. Check starter for proper operation.
CCN has signaled chiller to stop. Reset and restart when ready. Ifthe signal wassent by the LID, release the Stop signal on STATUS01 table.
Sparesafety inputhastripped orfactory-installed jumper not present.
Checkmotor currentfor proper calibration. Check guide vane drive and actuator for proper operation.
Check condenser flow and temperatures. Checkcon­figuration of surge protection.
Check starter for possible ground fault, reverse rota­tion, voltage trip, etc.
Reset overloads and reset alarm. Check motor cur­rent calibration or overload calibration (do not field­calibrate overloads).
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Table 12 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides (cont)
L. CHILLER PROTECT LIMIT FAULTS (cont)
Excessive numbers of the same fault can lead to severe chiller damage. Seek service expertise.
PRIMARY MESSAGE SECONDARY MESSAGE ALARM MESSAGE/PRIMARY CAUSE ADDITIONAL CAUSE/REMEDY PROTECTIVE LIMIT TRANSDUCER VOLTAGE FAULT V REF [VALUE]exceededlimit of[LIMIT]*.
PROTECTIVE LIMIT LOW GEAR OIL PRESSURE GEAROILP [VALUE] exceeded imit of PROTECTIVE LIMIT HIGH GEAR OIL TEMP GEAOILT [VALUE] exceeded limit of PROTECTIVE LIMIT CCN OVERRIDE STOP CHIL S S CCN. Override stop while in
*[LIMIT] is shown on the LID as the temperature, pressure, voltage, etc., set point predefined or selected by
the operator as an override, alert, or alarm condition. [VALUE] is the actual temperature, pressure, voltage, etc., at which the control tripped. [OPEN] indicates that an input circuit is open.
Check transducer power supply. [LIMIT]*. Check gear oil pump filter. [LIMIT]*. Check gear oil cooler filter.
local run mode.
Check transformer power (5 vdc) supply to transducers. Power must be 4.5 to 5.5 vdc.
Check for closed oil supply valves. Checkoil fil­ter. Check transducer accuracy.
Check for cooler water flow. Check sensor for accuracy.
Machine received a command from the net­work to stop overriding local operating mode.
M. CHILLER ALERTS
PRIMARY MESSAGE SECONDARY MESSAGE ALARM MESSAGE/PRIMARYCAUSE ADDITIONAL CAUSE/REMEDY
RECYCLE ALERT HIGH AMPS AT SHUTDOWN High Amps atRecycle: Checkguide vane
SENSOR FAULT ALERT LEAVING COND WATER TEMP SensorFault: Checkleaving condenser SENSOR FAULT ALERT ENTERING COND WATER TEMP Sensor Fault: Check entering condenser
LOW OIL PRESSURE ALERT
AUTORESTART PENDING POWER LOSS V P Power Loss: Check voltage AUTORESTART PENDING LOW LINE VOLTAGE V P[VALUE]exceeded limit of[LIMIT]*. AUTORESTART PENDING HIGH LINE VOLTAGE V P[VALUE]exceeded limitof [LIMIT]*. SENSOR ALERT HIGH DISCHARGE TEMP CMPD [VALUE] exceeded limit of
SENSOR ALERT HIGH BEARING TEMP MTRB [VALUE] exceeded limit of
CONDENSER PRESSURE ALERT
RECYCLE ALERT EXCESSIVE RECYCLE STARTS Excessive recycle starts. The chiller loadis toosmall tokeep thechiller
SENSOR ALERT LOW GEAR OIL PRESSURE GEAROILP [VALUE] exceeded imit of SENSOR ALERT HIGH GEAR OIL TEMP GEAOILT [VALUE] exceeded limit of
*[LIMIT] is shown on the LID as the temperature, pressure, voltage, etc., set point predefined or selected by
the operator as an override, alert, or alarm condition. [VALUE] is the actual temperature, pressure, voltage, etc., at which the control tripped.
CHECK OIL FILTER Low Oil Pressure Alert: Check oil Check oil filter.Check for improper oil level
PUMP RELAY ENERGIZED CRPHighCondenser Pressure [LIMIT]*.
drive.
water sensor. water sensor.
supply. Check voltage supply. Check voltage supply. [LIMIT]*. Check discharge
temperature. [LIMIT]*. Check thrust bearing
temperature. Pump energized to reduce pressure.
[LIMIT]*. Check gear oil pump filter. [LIMIT]*. Check gear oil cooler filter.
Check that guide vanes are closing. Check motor amps correction calibration is cor­rect. Check actuator for proper operation.
Check sensor. See sensor test procedure.
or temperature. Check power supply if there are excessive
compressor starts occurring.
Discharge temperature exceeded the alert threshold. Check entering condenser water temperature.
Thrust bearing temperature exceeded the alert threshold. Check for closed valves,im­proper oil level or temperatures.
Check ambient conditions. Check con­denser pressure for accuracy.
on line and there have been more than 5 restarts in 4 hours. Increase chillerload, ad­justhot gasbypass, increase
START DELTA T
Check for closed oil supply valves. Check oil filter. Check transducer accuracy.
Check for cooler water flow. Check sensor for accuracy.
from SERVICE1 screen.
RECYCLERE-
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Table 12 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages
with Troubleshooting Guides (cont)
N. OTHER PROBLEMS/MALFUNCTIONS
DESCRIPTION/MALFUNCTION PROBABLE CAUSE/REMEDY
Chilled Water/Brine Temperature Too High (Chiller Running)
Chilled Water/Brine Temperature Too Low (Chiller Running)
Chilled Water Temperature Fluctuates. Vanes Hunt Deadband toonarrow.Configure LID fora largerdeadband (SERVICE1screen).
Low Oil Sump Temperature While Running (Less than 100 F [38 C])
AtPower Up, DefaultScreen DoesNot Appear,‘‘TablesLoad­ing’’ Message Continually Appears
SMM Communications Failure Check thatPSIO communication plugs areconnectedcorrectly.Check SMM
High Oil Temperature While Running Check for proper oil level (too much oil). Check water supply to oil cooler. Blank LID Screen (Minimal Contrast Visible) Increase contrast potentiometer. See Fig. 49. Check red LED on LID for
‘‘Communications Failure’’ Highlighted Message At Bottom of LID Screen
Control Test Disabled Press the Stop pushbutton. The PIC must be in the OFF mode for the con-
Vanes Will Not Open in Control Test Low pressure alarm is active. Put chiller into PUMPDOWN mode or equal- Oil Pump Does Not Run Check oil pump voltage supply. Cooler vessel pressure under vacuum. LID Default Screen Does Not Update This is normal operation when an alarm is present. The screen freezes the
Chiller Does Not Stop When the STOP Button is Pressed The STOP button wiring connector on the LID module is not properly con-
LID Screen Dark Light bulb burned out. Replace as needed.
Chilled water set point set too high. Access set point on LID and verify. Capacityoverride or excessive coolingload (chiller atdesigncapacity). Check
LIDstatusmessages. Check foroutsideair infiltration intoconditioned space. Condenser temperature too high. Check for proper flow, examine cooling
tower operation, check for air or water leaks, check for fouled tubes. Refrigerant level low. Check for leaks, add refrigerant, and trim charge. Liquid bypass in waterbox. Examine division plates and gaskets for leaks. Guide vanes fail to open. Use control test to check operation. Chilled water control point too high. Access CONTROL ALGORITHM STA-
TUS table, MAINT01 screen, and check chilled water control operation. Guide vanesfailto open fully.Be sure that the guide vanetargetis released.
Check guide vane linkage. Check limit switch in actuator.Check that sensor is in the proper terminals.
Chilled water set point set too low. Access set point on LID and verify. Chilled water control point too low. Access CONTROL ALGORITHM STA-
TUS tables, MAINT01 screen, and check chilled water control for proper resets.
High discharge temperature keeps guide vanes open. Guide vanes fail to close. Be sure that guide vane target is released. Check
chilled water sensor accuracy. Check guide vane linkage. Check actuator operation.
Proportional bandstoo narrow.Either
PORTIONAL DEC BAND
Loose guide vane drive. Adjust chain drive. Defective vane actuator. Check using control test feature. Defective temperature sensor. Check sensor accuracy. Check for proper oil level (not enough oil).
Check for proper communications wiring on PSIO module. Check that the COMM1 communications wires from the LID are terminated to the COMM1 PSIO connection. Check for ground or short on CCN system wiring.
communicationplug.Check for proper SMMpower supply.See Control Mod­ules section on page 96.
proper operation, (power supply). If LED is blinking, but green LED’s are not, replace LID module, (memory failure). Check light bulb if backlit model.
LID is not properly addressed to the PSIO. Make sure that, on ATTACH TO NETWORK DEVICE screen,. dress.CheckLEDs on PSIO. Isred LED operating properly?Are greenLEDs blinking? See Control Module troubleshooting section.
trol test feature to operate. Clear all alarms. Check line voltage percent on STATUS01 screen. The percent must be within 90% to 110%. Check volt­age input to SMM; calibrate starter voltage potentiometer for accuracy.
ize pressure. Check guide vane actuator wiring. Pressurize vessel. Check temperature overload cutout switch. momentthe alarm isactivated to aidin troubleshooting. TheSTA TUS01screen
provides current information. nected or the chiller is in soft stop mode and the guide vanes are
closing.
should be increased (MAINT01 screen).
PROPORTIONALINC BANDorPRO-
LOCAL DEVICE
is set to read the PSIO ad-
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Table 13 — External Gear Troubleshooting Guide
PROBLEM POSSIBLE CAUSE — ITEM NO.s*
Excessive Operating Temperature 1,2,3,4,5,6,7,9,12,18,20,21 Oil Leakage 1,2,3,4,5,7,9,12,13,18,19,21 Gear Wear 1,2,3,4,6,7,8,9,10,11,12,13,14,15,16,18,19,21,22 Bearing Failure 1,6,7,8,9,10,11,12,15,16,19,20,21 Unusual Noise 1,2,3,4,6,7,8,9,10,11,12,13,15,16,17,20,21
*See table below for probable cause and suggested remedy.
POSSIBLE CAUSE ACTION
1. Unit Overload Reduce the loading.
2. Incorrect Oil Level Verify that the oil level is correct. Too little or too much oil can cause high
3. Wrong Oil Grade Use only the AGMA (American Gear Manufacturers Association) grade oil
4. Contaminated Oil If oil is oxidized, dirty, or has high sludge content, change the oil.
5. Clogged Breather Clean breather regularly.
6. Improper Bearing Clearance Too large or too small bearing clearance. Refer to drawing or contact the
7. Improper Coupling Alignment Disconnect couplings, check spacing between shafts, and check alignment.
8. Incorrect Coupling Rigid couplings can cause shaft failure. Replace with a coupling that pro-
9. Excessive Operating Speed Reduce the speed.
10. Torsional or Lateral Vibrations Vibrations can occur through a particular speed range known as the critical
11. Extreme Repetitive Shocks Apply couplings capable of absorbing shocks.
12. Improper Lubrication of Bearings Verify that all bearings are receiving adequate amounts of lubricating oil.
13. Improper Storage or Prolonged Shutdown Destructive rusting of bearings and gears will be caused by storage or pro-
14. Excessive Backlash Contact gear manufacturer.
15. Misalignment of Gears Contact pattern to be a minimum of 80% of face.
16. Housing Twisted or Distorted Verify proper shimming or stiffness of the foundation.
17. Gear Tooth Wear Contact gear manufacturer.
18. Open Drains Tighten drain plugs.
19. Loosely Bolted Covers Check all bolted joints and tighten if necessary.
20. Motor Related Verifythat actual operating conditions are consistent with motor nameplate.
21. Excessive Ambient Temperature Shield unit from heat source and maintain proper air flow around the gear
temperature. as specified for the unit size and ambient temperature.
gear manufacturer for correct clearance, checking technique, and toler­ance. Shafts should turn freely when disconnected from the load.
Realign as required. vides flexibility and lateral float.
speed. Contact the factory for specific recommendations.
longed shutdown in moist ambient temperatures. If rust is found, unit must be disassembled, inspected, and repaired.
unit.
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Table 14A — Thermistor Temperature (F) vs Resistance/Voltage Drop
TEMPERATURE VOLTAGE RESISTANCE
(F) DROP (V) (Ohms)
−25.0 4.821 98010
−24.0 4.818 94707
−23.0 4.814 91522
−22.0 4.806 88449
−21.0 4.800 85486
−20.0 4.793 82627
−19.0 4.786 79871
−18.0 4.779 77212
−17.0 4.772 74648
−16.0 4.764 72175
−15.0 4.757 69790
−14.0 4.749 67490
−13.0 4.740 65272
−12.0 4.734 63133
−11.0 4.724 61070
−10.0 4.715 59081
−9.0 4.705 57162
−8.0 4.696 55311
−7.0 4.688 53526
−6.0 4.676 51804
−5.0 4.666 50143
−4.0 4.657 48541
−3.0 4.648 46996
−2.0 4.636 45505
−1.0 4.624 44066
0.0 4.613 42679
1.0 4.602 41339
2.0 4.592 40047
3.0 4.579 38800
4.0 4.567 37596
5.0 4.554 36435
6.0 4.540 35313
7.0 4.527 34231
8.0 4.514 33185
9.0 4.501 32176
10.0 4.487 31202
11.0 4.472 30260
12.0 4.457 29351
13.0 4.442 28473
14.0 4.427 27624
15.0 4.413 26804
16.0 4.397 26011
17.0 4.381 25245
18.0 4.366 24505
19.0 4.348 23789
20.0 4.330 23096
21.0 4.313 22427
22.0 4.295 21779
23.0 4.278 21153
24.0 4.258 20547
25.0 4.241 19960
26.0 4.223 19393
27.0 4.202 18843
28.0 4.184 18311
29.0 4.165 17796
30.0 4.145 17297
31.0 4.125 16814
32.0 4.103 16346
33.0 4.082 15892
34.0 4.059 15453
35.0 4.037 15027
36.0 4.017 14614
37.0 3.994 14214
38.0 3.968 13826
39.0 3.948 13449
40.0 3.927 13084
41.0 3.902 12730
42.0 3.878 12387
43.0 3.854 12053
44.0 3.828 11730
45.0 3.805 11416
46.0 3.781 11112
47.0 3.757 10816
48.0 3.729 10529
49.0 3.705 10250
50.0 3.679 9979
51.0 3.653 9717
52.0 3.627 9461
53.0 3.600 9213
54.0 3.575 8973
55.0 3.547 8739
56.0 3.520 8511
57.0 3.493 8291
58.0 3.464 8076
59.0 3.437 7868
60.0 3.409 7665
61.0 3.382 7468
62.0 3.353 7277
63.0 3.323 7091
64.0 3.295 6911
65.0 3.267 6735
66.0 3.238 6564
67.0 3.210 6399
68.0 3.181 6238
69.0 3.152 6081
70.0 3.123 5929
TEMPERATURE VOLTAGE RESISTANCE
(F) DROP (V) (Ohms)
71 3.093 5781 72 3.064 5637 73 3.034 5497 74 3.005 5361 75 2.977 5229 76 2.947 5101 77 2.917 4976 78 2.884 4855 79 2.857 4737 80 2.827 4622 81 2.797 4511 82 2.766 4403 83 2.738 4298 84 2.708 4196 85 2.679 4096 86 2.650 4000 87 2.622 3906 88 2.593 3814 89 2.563 3726 90 2.533 3640 91 2.505 3556 92 2.476 3474 93 2.447 3395 94 2.417 3318 95 2.388 3243 96 2.360 3170 97 2.332 3099 98 2.305 3031
99 2.277 2964 100 2.251 2898 101 2.217 2835 102 2.189 2773 103 2.162 2713 104 2.136 2655 105 2.107 2597 106 2.080 2542 107 2.053 2488 108 2.028 2436 109 2.001 2385 110 1.973 2335 111 1.946 2286 112 1.919 2239 113 1.897 2192 114 1.870 2147 115 1.846 2103 116 1.822 2060 117 1.792 2018 118 1.771 1977 119 1.748 1937 120 1.724 1898 121 1.702 1860 122 1.676 1822 123 1.653 1786 124 1.630 1750 125 1.607 1715 126 1.585 1680 127 1.562 1647 128 1.538 1614 129 1.517 1582 130 1.496 1550 131 1.474 1519 132 1.453 1489 133 1.431 1459 134 1.408 1430 135 1.389 1401 136 1.369 1373 137 1.348 1345 138 1.327 1318 139 1.308 1291 140 1.291 1265 141 1.289 1240 142 1.269 1214 143 1.250 1190 144 1.230 1165 145 1.211 1141 146 1.192 1118 147 1.173 1095 148 1.155 1072 149 1.136 1050 150 1.118 1029 151 1.100 1007 152 1.082 986 153 1.064 965 154 1.047 945 155 1.029 925 156 1.012 906 157 0.995 887 158 0.978 868 159 0.962 850 160 0.945 832 161 0.929 815 162 0.914 798 163 0.898 782 164 0.883 765 165 0.868 750 166 0.853 734
TEMPERATURE VOLTAGE RESISTANCE
(F) DROP (V) (Ohms)
167 0.838 719 168 0.824 705 169 0.810 690 170 0.797 677 171 0.783 663 172 0.770 650 173 0.758 638 174 0.745 626 175 0.734 614 176 0.722 602 177 0.710 591 178 0.700 581 179 0.689 570 180 0.678 561 181 0.668 551 182 0.659 542 183 0.649 533 184 0.640 524 185 0.632 516 186 0.623 508 187 0.615 501 188 0.607 494 189 0.600 487 190 0.592 480 191 0.585 473 192 0.579 467 193 0.572 461 194 0.566 456 195 0.560 450 196 0.554 445 197 0.548 439 198 0.542 434 199 0.537 429 200 0.531 424 201 0.526 419 202 0.520 415 203 0.515 410 204 0.510 405 205 0.505 401 206 0.499 396 207 0.494 391 208 0.488 386 209 0.483 382 210 0.477 377 211 0.471 372 212 0.465 367 213 0.459 361 214 0.453 356 215 0.446 350 216 0.439 344 217 0.432 338 218 0.425 332 219 0.417 325 220 0.409 318 221 0.401 311 222 0.393 304 223 0.384 297 224 0.375 289 225 0.366 282
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Table 14B — Thermistor Temperature (C) vs Resistance/Voltage Drop
TEMPERATURE VOLTAGE RESISTANCE
(C) DROP (V) (Ohms)
−40 4.896 168 230
−39 4.889 157 440
−38 4.882 147 410
−37 4.874 138 090
−36 4.866 129 410
−35 4.857 121 330
−34 4.848 113 810
−33 4.838 106 880
−32 4.828 100 260
−31 4.817 94 165
−30 4.806 88 480
−29 4.794 83 170
−28 4.782 78 125
−27 4.769 73 580
−26 4.755 69 250
−25 4.740 65 205
−24 4.725 61 420
−23 4.710 57 875
−22 4.693 54 555
−21 4.676 51 450
−20 4.657 48 536
−19 4.639 45 807
−18 4.619 43 247
−17 4.598 40 845
−16 4.577 38 592
−15 4.554 38 476
−14 4.531 34 489
−13 4.507 32 621
−12 4.482 30 866
−11 4.456 29 216
−10 4.428 27 633
−9 4.400 26 202
−8 4.371 24 827
−7 4.341 23 532
−6 4.310 22 313
−5 4.278 21 163
−4 4.245 20 079
−3 4.211 19 058
−2 4.176 18 094
−1 4.140 17 184 0 4.103 16 325 1 4.065 15 515 2 4.026 14 749 3 3.986 14 026 4 3.945 13 342 5 3.903 12 696 6 3.860 12 085 7 3.816 11 506 8 3.771 10 959 9 3.726 10 441
10 3.680 9 949 11 3.633 9 485 12 3.585 9 044 13 3.537 8 627 14 3.487 8 231 15 3.438 7 855 16 3.387 7 499 17 3.337 7 161 18 3.285 6 840 19 3.234 6 536 20 3.181 6 246 21 3.129 5 971 22 3.076 5 710 23 3.023 5 461 24 2.970 5 225 25 2.917 5 000 26 2.864 4 786 27 2.810 4 583 28 2.757 4 389 29 2.704 4 204 30 2.651 4 028 31 2.598 3 861 32 2.545 3 701 33 2.493 3 549 34 2.441 3 404 35 2.389 3 266 36 2.337 3 134 37 2.286 3 008 38 2.236 2 888 39 2.186 2 773 40 2.137 2 663 41 2.087 2 559 42 2.039 2 459 43 1.991 2 363 44 1.944 2 272
TEMPERATURE VOLTAGE RESISTANCE
(C) DROP (V) (Ohms)
45 1.898 2 184 46 1.852 2 101 47 1.807 2 021 48 1.763 1 944 49 1.719 1 871 50 1.677 1 801 51 1.635 1 734 52 1.594 1 670 53 1.553 1 609 54 1.513 1 550 55 1.474 1 493 56 1.436 1 439 57 1.399 1 387 58 1.363 1 337 59 1.327 1 290 60 1.291 1 244 61 1.258 1 200 62 1.225 1 158 63 1.192 1 118 64 1.160 1 079 65 1.129 1 041 66 1.099 1 006 67 1.069 971 68 1.040 938 69 1.012 906 70 0.984 876 71 0.949 836 72 0.920 805 73 0.892 775 74 0.865 747 75 0.838 719 76 0.813 693 77 0.789 669 78 0.765 645 79 0.743 623 80 0.722 602 81 0.702 583 82 0.683 564 83 0.665 547 84 0.648 531 85 0.632 516 86 0.617 502 87 0.603 489 88 0.590 477 89 0.577 466 90 0.566 456 91 0.555 446 92 0.545 436 93 0.535 427 94 0.525 419 95 0.515 410 96 0.506 402 97 0.496 393 98 0.486 385
99 0.476 376 100 0.466 367 101 0.454 357 102 0.442 346 103 0.429 335 104 0.416 324 105 0.401 312 106 0.386 299 107 0.370 285
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Control Modules
Turn the controller power off before servicing the con­trols. This ensures safety and prevents damage to the controller.
The Processor/Sensor Input/Output module (PSIO), 8-input (Options) modules, Starter Management Module (SMM), 4-in/2-out module, and the Local Interface Device (LID) mod­ule perform continuous diagnostic evaluations of the hard­ware to determine its condition. Proper operation of all modules is indicated by LEDs (light-emitting diodes) located on the side of the LID (Fig. 49); on the top horizontal surface of the PSIO (Fig. 50), SMM, and 8-input modules; and on the 4-in/ 2-out module.
RED LEDs PSIO Module — If the LED is blinking continuously at a
2-second rate, it is indicating proper operation. If it is lit con­tinuously it indicates a problem requiring replacement of the module. Off continuously indicates that the power should be checked. If the red LED blinks 3 times per second, a soft­ware error has been discovered and the module must be re­placed. If there is no input power, check the fuses and the circuit breaker. If the fuses are good, check for a shorted secondary of transformer, or if power is present to the mod­ule, replace the module.
4-In/2-Out Module — If the LED is blinking, this module is operating properly.Asteady red light indicates a module fail­ure. Replace the 4-In/2-Out module.
GREEN LEDs — There are 1 or 2 green LEDs on each type of module. These LEDs indicate communication status be­tween different parts of the controller and the network mod­ules as follows:
LID Module Upper LED — Communication with CCN network, if present;
blinks when communication occurs. Lower LED — Communication with PSIO module; must blink
every 5 to 8 seconds when the LID default screen is displayed.
PSIO Module GreenLED Closest to Communications Connection — Com-
munication with SMM and 8-input module; must blink continuously.
Other Green LED — Communication with LID; must blink every 3 to 5 seconds.
8-Input Modules and SMM — Communication with PSIO module; blinks continuously.
4-In/2-Out Module — Communication with PSIO module; blinks continuously.
NOTE: Address switches on this module can be at any position. Ad­dresses are only changed through the LID screen for CCN.
Fig. 49 — LID Module (Rear View) and
LED Locations
Notes on Module Operation
1. The chiller operator monitors and modifies configura­tions in the microprocessor through the 4 softkeys and the LID. Communication with the LID and the PSIO is accomplished through the CCN bus (COMM1). The com­munication between the PSIO, SMM, both 8-input mod­ules, and the 4-in/2-out module is accomplished through the sensor bus (COMM3), which is a 3-wire cable. On the sensor bus terminal strips, Terminal 1 of the PSIO module is connected to Terminal 1 of each of the other modules. Terminals 2 and 3 are connected in the same manner, except for the connection to the 4-in/2-out mod­ule. See Fig. 51.
2. If a green LED is on continuously, check the communi­cation wiring. If a green LED is off, check the red LED operation. If the red LED is normal, check the module address switches (Fig. 52-54). Proper addresses are set as shown below:
MODULE
SMM (Starter Management Module) 32 8-input Options Module 1 64 8-input Options Module 2 72
MODULE
4-In/2-Out Module OOOOCOCO
O—Open C—Closed
12345678
SWITCH
ADDRESS
S1 S2
Fig. 50 — PSIO Module LED Locations
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If all modules indicate a communications failure, check the communications plug on the PSIO module for proper seating.Also check the wiring (CCN bus — 1:red, 2:wht, 3:blk; Sensor bus — 1:red, 2:blk, 3:clr/wht). If a good connection is assured and the condition persists, replace the PSIO module.
If only one 8-input module, the SMM, or the 4-in/2-out module indicates a communication failure, check the com­munications plug on that module. If a good connection is assured and the condition persists, replace the module.
All system operating intelligence rests in the PSIO mod­ule. Some safety shutdown logic resides in the SMM in case communications are lost between the 2 modules. The PSIO monitors conditions using input ports on the PSIO, the SMM, the 8-input modules, and the 4-in/2-out mod­ules. Outputs are controlled by the PSIO and SMM as well.
3. Power is supplied to the modules within the control panel. The transformers are located within the power panel, with the exception of the SMM, which operates from a 24-vac power source and has its own 24-vac transformer located in the starter.
In the power panel, T1 supplies power 21-vac to the LID, the PSIO, and the 5-vac power supply for the transduc­ers. T3 supplies 24-vac power to the 4-in/2-out module. T4 is another 21-vac transformer, which supplies power to both 8-input modules (if present). T4 is capable of sup­plying power to two modules; if additional modules are added, another power supply will be required.
Power is connected to Terminals 1 and 2 of the power input connection on each module.
PSIO (J8)
1
2
3
+
GRD
-
SMM (J5)
1
2
3
+
GRD
-
8-INPUT (J5)
1
GRD
2
3
+
-
8-INPUT (J5)
+
1
GRD
2
-
3
4-IN/2-OUT (J3)
+
1
-
2
GRD
3
NOTE:Address switcheson this module can be at any position.Addresses can only be changed through the LID or CCN.
Fig. 52 — Processor (PSIO) Module
Starter Management Module (SMM) (Fig. 53)
INPUTS — Inputs on strips J2 and J3 are a mix of analog and discrete (on/off) inputs. The chiller application deter­mines which terminals are used. Always refer to the indi­vidual unit wiring diagram for terminal numbers.
OUTPUTS — Outputs are 24 vdc and wired to strip J1. There are 2 terminals used per output.
LEGEND
GRD — Ground J—Junction SMM — Starter Management
Module
PSIO — Processor/Sensor Input/
Output Module Pins
Fig. 51 — Sensor Input/Output (SIO) Wiring
Schematic for COMM3 Bus
Processor/Sensor Input/Output Module (PSIO) (Fig. 52)
INPUTS — Each input channel has 3 terminals; only 2 of the terminals are used. The chiller application determines which terminals are normally used. Always refer to individual unit wiring diagrams for terminal numbers.
OUTPUTS — Output is 20 vdc. There are 3 terminals per output, only 2 of which are used, depending on the appli­cation. Refer to the unit wiring diagram.
NOTE: SMM address switches should be set as follows: S1 set at 3; S2 set at 2.
Fig. 53 — Starter Management Module (SMM)
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Options Modules (8-Input) — The options modules
are optional additions to the PIC, and are used to add tem­perature reset inputs, spare sensor inputs, and demand limit inputs. Each option module contains 8 inputs, each input meant for a specific duty. See the wiring diagram for exact module wire terminations. Inputs for each of the options modules available include the following:
4 to 20 mA Auto. Demand Reset 4 to 20 mA Auto. Chilled Water Reset Common Chilled Water Supply Temperature Common Chilled Water Return Temperature Remote Temperature Reset Sensor Spare Temperature 1 Spare Temperature 2 Spare Temperature 3
Terminal block connections are provided on the options modules. All sensor inputs are field wired and installed. Options module 1 can be factory or field-installed. Options module 2 is shipped separately and must be field installed. For installation, refer to the unit or field wiring diagrams. Be sure to address the module for the proper module number (Fig. 54) and to configure the chiller for each feature being used.
OPTIONS MODULE 1
OPTIONS MODULE 2 4 to 20 mA Spare 1
4 to 20 mA Spare 2 Spare Temperature 4 Spare Temperature 5 Spare Temperature 6 Spare Temperature 7 Spare Temperature 8 Spare Temperature 9
configurations. The inputs monitor the gear oil temperature and pressure. InputAI#2 should be factory-set with the jumper on (T). Inputs AI#3, and AI#4 should be factory set on (V).
OUTPUTS — The two analog outputs are each configurable by on-board jumpers as 0 to 10 vdc (maximum current: 10 mA) or 4 to 20 mA (maximum load: 600 ohms) outputs. The outputs control the relay that activates the gear oil pump starter. Outputs AO#1 and AO#2 should be factory set with the jumper on (V).
This module has a field-configurable DIP (dual in-line pack­age) switch to designate its address. It should be factory set with the following switches open: 1, 2, 3, 4, 6, and 8. Switches 5 and 7 should be closed.
Note the SIO bus wiring for this module. Unlike the stand­ard PIC modules, Pin 2 is negative and Pin 3 is the ground (or common). See Fig. 51.
Replacing Defective Processor Modules — The
replacement part number is printed on a small label on the front of the PSIO module. The model and serial numbers are printed on the unit nameplate located on an exterior corner post. The proper software is factory-installed by Carrier in the replacement module. When ordering a replacement pro­cessor module (PSIO), specify complete replacement part num­ber, full unit model number, and serial number. This new unit requires reconfiguration to the original chiller data by the installer. Follow the procedures described in the Set Up Chiller Control Configuration section on page 54. Electrical shock can cause personal injury.Disconnect all electrical power before servicing.
SWITCH SETTING OPTIONS MODULE 1 OPTIONS MODULE 2
S1 67 S2 42
Fig. 54 — Options Module
Four-In/Two-Out Module (Fig. 55)
INPUTS — The four analog inputs each have 3 terminals and are configurable by movable on-board jumpers as ther­mistor (T), 4 to 20 mA (C), or 0 to 10 vdc (V)
Electrical shock can cause personal injury. Disconnect all electrical power before servicing.
INSTALLATION OF NEW PSIO MODULE
1. Verify that the existing PSIO module is defective by us­ing the procedure described in the Notes on Module Op­eration section, page 96, and the Control Modules sec­tion, page 96. Do not access theATTACHTO NETWORK DEVICE screen if the LID displays a communication failure.
2. Data regarding the PSIO configuration should have been recorded and saved. This data must be reconfigured into the LID. If this data is not available, follow the proce­dures described in the Set Up Chiller Control Configu­ration section, page 54. Record the TOTAL COMPRES- SOR STARTSand the COMPRESSOR ONTIME from the STATUS01 table on the LID.
If a CCN Building Supervisor or Service Tool is present, the module configuration should have already been up­loaded into memory; then, when the new module is in­stalled, the configuration can be downloaded from the computer (if the software version is the same).
Any communication wires from other chillers or CCN modules must be disconnected.
3. Check that all power to the unit is off. Carefully dis­connect all wires from the defective module by unplug­ging the 6 connectors. It is not necessary to remove any of the individual wires from the connectors.
4. Remove the defective PSIO by removing its mounting screw with a long-shaft Phillips screwdriver and remov­ing the module from the control box. Save the screw for later use. The green ground wire is held in place with the module mounting screw.
5. Package the defective module in the carton of the new module for return to Carrier.
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6. Restore control system power (the LID displays, COM­MUNICATION FAILURE at the bottom of the screen).
7. Access the SERVICE menu. Highlight and select the ATTACH TO NETWORK DEVICE screen. Press
the ATTACH softkey. (The LID displays, UPLOAD­ING TABLES. PLEASE WAIT; then, COMMUNICA-
TION FAILURE.) Press the EXIT
8. Turn off control power.
9. Mount the new module in the unit control box using a long-shaft Phillips screwdriver and the screw saved in Step 4 on page 98. Make sure that the green grounding wire is reinstalled along with the mounting screw.
10. Connect the LID communication wires (CCN bus) and the power wires. If CCN wiring has been attached to the CCN bus, disconnect the wires. Attach the sensor bus plug and the input and output plugs.
11. Carefully check all wiring connections before restoring
power.
12. Restore control power and verify that the red and green LEDs on the PSIO are functioning properly.
13. The LID should indicate AVAILABLE MEMORY and a value. This value should start to decrease. (If it does not, check the LID wiring to the PSIO; ensure connec­tion to the proper plug.) The bottom of the screen dis­plays, UPLOADING TABLES, PLEASE WAIT.
14. After the PSIO tables have been uploaded into the LID, access the STATUS01 screen. Move the highlight bar to the TOTAL COMPRESSOR STARTS line. Press the
SELECT DECREASE
softkey and then, using the INCREASE or
softkeys, change the value until it is the
softkey.
same as the value from the old module. Press the
ENTER
15. Move the highlight bar to the COMPRESSOR ONTIME line. Press the SELECT ing the INCREASE
this value until it matches the old module run hours. Press the SELECT
16. Change the address of the PSIO In the CONTROLLER IDENTIFICATION table back to its previous value. Write the address on the PSIO.
17. Use the configuration sheets (pages CL-3 to CL-11) to input set point, configuration, and schedule information into the PSIO. The TIME AND DATE table from the SERVICE menu must also be set. A Building Supervi­sor terminal can be used to download the old configu­ration into the PSIO.
18. Access the CONTROL TEST table and perform the con­trol tests to verify all that all tested functions are work­ing properly.
If the software version has been updated, a CCN down­load of the configuration will not be allowed. Configure the PSIO by hand, and upload the PSIO into the net­work using the ATTACH TO NETWORK DEVICE screen.
19. Restore the chiller to normal operation; calibrate the mo­tor amps.
softkey to save this value.
softkey and the, us-
or DECREASE softkeys, change
softkey to save this value.
PHYSICAL DATA AND WIRING
SCHEMATICS
Tables 15-26 and Fig. 56-61 provide additional informa­tion regarding compressor fits and clearances, physical and electrical data, and wiring schematics for operator conve­nience during troubleshooting.
Fig. 55 — 4-In/2-Out Module
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Fig. 56 — Model Number Nomenclature for Compressor Size (See Fig. 1 Also)
Table 15 — 17EX Heat Exchanger Economizer/Storage Vessel, Piping, and Pumpout Unit Weights*
COOLER
COOLER
SIZE†
45 25,032 11 355 30,098 13 652 2,060 934 3,006 361 1 364 1366 46 25,529 11 580 30,881 14 008 2,160 980 3,192 383 1 448 1450 47 26,025 11 805 31,663 14 362 2,260 1 025 3,378 405 1 532 1533 48 28,153 12 770 34,866 15 815 2,540 1 152 4,173 500 1 893 1893
lb kg lb kg lb kg lb gal kg L
TOTAL
WEIGHT
Dry** Operating†† Refrigerant Water
COOLER CHARGE
ECONOMIZER/
STORAGE
VESSEL
lb kg lb kg lb kg lb kg
7,900 3 583 840 318 1,149 521 210 95
ECONOMIZER
REFRIGERANT
MISCELLANEOUS
PIPING
PUMPOUT
UNIT
CONDENSER
SIZE†
45 16,676 7 564 20,596 9 342 1,200 544 2,720 1 234 46 17,172 7 789 21,280 9 653 1,200 544 2,908 1 319 47 17,669 8 015 21,965 9 963 1,200 544 3,096 1 404 55 20,725 9 401 25,598 11611 1,420 644 3,453 1 566 56 21,663 9 826 26,891 12 198 1,420 644 3,808 1 727 57 22,446 10 182 27,971 12 688 1,420 644 4,105 1 862
*If a chiller configuration otherthan 2-pass, 150 psig (1034 kPa), NIH waterbox
configuration is used, referto Tables16 and 17to obtainthe additional dryand water weights that must be added to the values shown in this table.
†Cooler and condenser weights shown are based on 2-pass, nozzle-in-head
(NIH) waterboxes with 150 psig (1034 kPa) covers. Includes components at­tached to cooler, but does not include suction/discharge, elbow, or other interconnecting piping.
CONDENSER TOTAL WEIGHT CONDENSER CHARGE
Dry** Operating†† Refrigerant Water
lb kg lb kg lb kg lb kg
**Dryweight includesall components attached to economizer:covers, floatvalves,
brackets, control center (31 lb [14 kg]), and power panel (20 lb [9 kg]). Dry weight does not include compressor weight, motor weight, or pumpout con­densing unit weight. The pumpout condensing unit weight is 210 lb (95 kg). For compressor and motor weights, refer to Tables 18 and 20A and 20B.
††Operating weight includes dry weight, refrigerant weight, and water weight.
Table 16 — Additional Cooler Weights*
COOLER
FRAME
WATERBOX
TYPE
NUMBER
OF PASSES
DESIGN MAXIMUM
WATER PRESSURE
psig kPa lb kg lb gal kg L
NIH 1, 3 150 1034 515 234 — NIH 1, 3 300 2068 2941 1334 — NIH 2 300 2068 2085 946
4
Marine 1, 3 150 1034 2100 953 5102 612 2314 2314 Marine 2 150 1034 792 359 2551 306 1157 1157 Marine 1, 3 300 2068 3844 1744 5102 612 2314 2314 Marine 2 300 2068 2536 1150 2551 306 1157 1157
*When using a chiller configuration other than 2-pass, NIH waterboxes with 150 psig (1038 kPa) covers, add the weighs listed in this table to the
appropriate weights in Table 15 to obtain the correct cooler weight.
ADDITIONAL
DRY WEIGHT
ADDITIONAL
WATER WEIGHT
100
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